Failure of usb outputs on a laptop. USB ports not working

USB ports stopped working on a Windows computer and laptop? The first step is to check each port on the computer, if everything does not work, you need to establish the cause.

The easiest and most reliable way is to connect a USB keyboard, turn off the computer, turn it on and try to enter the BIOS in a familiar way. If you get into the BIOS in a way that you couldn’t get through one port before, then the reason is technical.

In this case, you need to open the system unit and check the connection of the USB connectors to the motherboard. If everything is in order, you need to install a discrete USB card in the PCI slot and check if the ports from it work (maybe your motherboard is burned).

If you can get into the BIOS, and USB ports do not work in the operating system, you should check for installed drivers, reinstall them, update to the latest version.

Sometimes USB ports do not work if newer version equipment is connected to them (up to USB 1.0 or USB 2.0, a USB 3.0 flash drive or external HDD is connected), so it is worth checking the equipment for compatibility.

Remember that USB ports, in addition to transmitting information, also have power ports, so it often happens that due to a weak power supply, they may also not work correctly.

If the computer or any application does not work correctly after connecting the device to the USB port, then there may be several reasons for this. Before you can pinpoint the source of the problem, you need to check the operation of the peripheral device, USB port, or USB driver. Below we list a few simple steps that will help you identify the problem and fix it yourself without going to a computer wizard.

In order to reload the USB driver and software that are in conflict, all you have to do is restart your computer. Very often this helps to fix the problem.

Sometimes a different order can help. Turn off the computer and disconnect any devices connected to the USB ports, including the keyboard and mouse. Turn on the computer again and when the operating system boots up, connect all the peripheral devices that were previously disconnected to the USB ports one by one. If a problem occurs when connecting a specific device, such as USB RAM, note for yourself on which port it happened. Try connecting this device to another free port. If the problem is gone, then the specific USB port is bad. Otherwise, the problem must be looked for either in a peripheral device or in a USB cable.

USB cable and connector

In the event that the USB port does not work, very often the cause of the malfunction may be damage to the cable or connector. Carefully inspect these connection elements for damage such as cracks, chips or cuts. Look inside the USB port and connector and check for dirt, dust, or other small items. You can clean the connectors yourself with a dry brush or an air compressor (vacuum cleaner). This must be done with the cable disconnected. If the interface cable is severely bent or broken, then you should immediately replace it - a new cable costs a penny.

Delimitation of the problem - port or device

If the program or computer stops working immediately after connecting a new device to the USB port, then you should try connecting another device to it. If the computer continues to operate normally, then the problem is with the peripheral. Do you have a second computer? Try to connect a suspicious device to it and double-check its performance. If the situation repeats itself, it definitely needs to be changed. If you used a USB hub, exclude it from the connection chain. In case of USB problems, the device should be connected directly. In addition, problems can arise if you connect a lot of peripherals at the same time or connect several devices of the same model at the same time, for example, two smartphones or printers.

Driver reinstallation

Windows usually issues a message if there is a problem with the USB driver. If this happens, open the "Control Panel" through the start menu of the operating system. Find the “Device Manager” item in it, open the utility and find the subsection “USB Controllers” or “USB Controllers” in the list of installed equipment. Expand this item and find in the list of USB devices the item that is marked with an exclamation mark on a yellow background. If you find such a device, right-click on it and select the "Delete" context menu item. Reboot your computer. After that, the operating system will automatically reinstall the removed driver immediately after it boots. If reinstalling the driver did not resolve the issue, you should try updating it.

Driver update

If the USB port is not working, you can try manually updating the USB device driver. To do this, open the "System and Security" section in the "Control Panel", in which find the "Device Manager" subsection. Enter administrator credentials if prompted by the system. Next, find the problematic USB device in the USB Controllers list and double-click on it to open the configuration dialog. Open the "Driver" tab, and in it click the "Update" button. To start the driver update, enter your system administrator credentials again. After the update, restart your computer and check the performance of the problem device.

What is the difference between the USB ports on the back of the computer and those on the front? The difference is that those USB ports that are on the back connect directly to the USB controller, which is located on the motherboard itself and is an integral part of it. But the front USB ports go through a USB hub and are connected via a cable, and here it may be that the cable is of poor quality, and problems with the ports may appear.

If you connect two power-demanding USB devices (for example, a portable hard drive and a phone) to two USB ports on the front panel at once, then there will be a lack of power in one of these devices, and it will either not work correctly or will not work at all. Why ask you? The USB controller provides the device connected to it with power -500 mA at 5 V. If the USB interface device does not have an additional power adapter, then it must work from the USB interface, without additional power, that is, 5 V should be enough, but if the controller Two devices are connected via a USB hub.

The USB ports on the front of the computer are USB hubs that have one 9-pin input connector for connecting to the motherboard on one side and several USB ports for connecting devices on the other. The USB hub cable transmits information to the connected device, and also supplies it with electricity, but if there are two devices, and the hub is still powered by 500 mA at 5 V, then of course the devices do not have enough power.

You can connect a mouse, keyboard and flash drive to the USB hub, and if you want to use other devices such as a smartphone, external hard drive, etc. , you must use a USB hub with an additional power supply supplying 5V to each of its USB ports.
USB ports not working

If you suspect that the USB port on your computer is not working, check the device you are connecting to another computer. After all, it also happens that it is not the USB port that does not work, but the device that you are trying to connect, but it happens the other way around. Check the device on another computer. In the Award BIOS, find the Integrated Peripherals parameter, and in the Ami BIOS the Advanced parameter, go into them and see the USB Configuration item, press Enter, our USB Controller or USB Controller 2.0, should be in the Enabled position, that is, it is on .

USB ports not working

It also happens that the USB port is working, and the device is working properly, but there is no connection between the computer and the device ...... here the malfunction may be in the USB cable. And there are cases when the USB ports on the front panel are not connected at all.
Could the USB hub be faulty? Try another USB hub with a good shielded cable. Connect it to another 9-pin connector on the motherboard.

Sometimes the USB ports on the front panel are connected using pin cables (they also say in bulk), it may well be that the cable is faulty or the pinouts are mixed up.

Also, the reason for the failure of USB ports can be a low-power, and possibly not working, power supply.
Or maybe the southbridge is faulty. Do not forget about updating drivers for both connected devices and the motherboard chipset.

You can reboot the USB hub and the connected device will stop responding to you, this is cured by a normal reboot of the computer. Almost all USB hubs have power management and Windows can turn off the device to save power.

Firstly, if when you connect a flash drive to a computer or some other equipment, the port does not work quite correctly or the device connected to the computer is not detected by the system at all, then in this case you should make sure that the controller is turned on. PC motherboard.

Quite often, users forget to turn on the USB controller. It seems to be a simple, but still common problem when the user started the PC, but the device was not detected. It is possible to fix everything here, for this you need to go into the BIOS and enable the corresponding parameter. By the way, if you do not know what BIOS is, then I recommend that you definitely read the article

So, go to the BIOS, find the item "Integrated Peripherals - this applies to the Award BIOS", or in the Ami BIOS - Advanced ".

Next, press "Enter" and go to "Onboard Devices Configuration" and make sure that the items "USB Function" and "USB 2.0 Controller" are in the "Enabled" position. If so, then everything is included. Otherwise, the parameter can be turned off (OFF), position "Disabled". If the option is disabled, then enable it. Next, save the changes, then reboot the PC system and check the USB port is working. Be sure to check if the USB ports on the front panel of the system unit are connected to the motherboard itself using the so-called block.

If the port still does not work, then move on.

Secondly, maybe the problem is in the inoperability of the port and is completely hidden in the USB extension cable? For example, there are situations when the computer does not recognize a peripheral device (printer), for the simple reason that the USB cable itself is simply damaged. The reason for cable damage can be very diverse, for example, you accidentally put a chair on a cable or some heavy object and simply pinched it. Therefore, do not be too lazy to check the cable itself.

Thirdly, it is quite rare to encounter such a problem when the USB port does not have enough power. I will give you a specific example. Imagine that you have connected a USB flash drive and a printer to the front of the case of the system unit in the USB connector. As a result, the operating system, when sending data for printing, informs us that the document could not be printed. In general, your computer simply does not see the printer. And if you restart your computer, the printer is detected by the system, and you can easily print a document. However, after a while, the computer loses its connection to the printer again and the printer does not print. Do you know why?

Such a seemingly banal problem at first glance is due to the fact that there was a lack of power for the USB port. As a result, the USB port refuses to function properly. Basically, such an incident associated with a lack of power occurs when connecting several devices to the front panel USB ports.

Of course, not always, but such situations do occur. These USB ports are connected to the motherboard with a cable. This cable, in addition to data transfer, also provides power to the USB hubs themselves. It is possible that the power supplied to two devices connected to the USB hub at the same time may not be enough. In this case, I can recommend that you connect the printer to the built-in USB port, which is located on the PC motherboard.

You can also change the CMOS battery on the board. It happens that the problem disappears completely after replacing the battery on the motherboard. What is this battery and where is it, you can find out in this article:

In general, if your USB port, which is located on the front panel of the system unit case, does not work for you, then try to replace the USB hub itself. Who knows, maybe it is he who is faulty.

You can also try plugging the cable into a different USB port on the motherboard.

Fourthly, if the USB port controller, which is responsible for detecting and starting the device itself, still fails, then things are, of course, bad. There is, of course, the opportunity to take and solder the controller itself on the motherboard, but this takes time, you need to have the controller itself, and, of course, the soldering station itself. From the point of view of time costs, it is not quite reasonable. Another option is to entrust it to specialists, although there are also some pitfalls here, the price, the quality of work, as well as the competence of a specialist who specifically works on this problem.

Fifth, peripheral and mobile devices may not be recognized on your computer due to the lack of drivers and special software. It cannot be ruled out that if you have been using your operating system for quite a long time and the system has not been updated at all, and indeed the Windows assembly is not the original version, then in this case it is the case that the drivers are already considered outdated and therefore the system freezes happen all the time.

Sometimes Windows disables the USB hub altogether to save power. To prevent the USB device from being disconnected, you need to do the following.

Open the "Device Manager" by right-clicking on the "Computer" icon and selecting "Properties".

After the Device Manager window has opened, double-click the left mouse button on "USB Controllers", expand the branch.

Now you just have to go to the root USB hub and uncheck the box in the "Power Management" section, as shown in the figure below.

Sixth, sometimes reinstalling the operating system helps fix the problem when the USB port does not work. Although, of course, first try to roll back the system to a previous state. Here is an article that will show you how to do it:

Seventh, it is possible that your system has some kind of faulty hardware, which is just the same as an obstacle to the normal operation of the USB port.

This problem is very relevant in our time. After all, quite often users directly encounter this. So, there is a solution. USB ports can hang on the computer, contacts can close, and many more additional problems can occur when working at the computer.

We find a way out of our situation, check all devices for connection and disconnection. You will need to disconnect all devices and connect one at a time, for example, connect the keyboard first and see if it works, then connect the next device, let it be a mouse and so on. Connect additional USB devices, if they don’t work, then the problem is solved or you need to look in peripheral devices, maybe something is shorting there, but you never know.

Eighth, they generally forgot to enable the serial bus controller in the device manager. There are moments when you do not pay attention to the work of USB devices, turn on the computer, download music, listen and enjoy new works of art. True, everything comes unexpectedly, suddenly a USB device was needed, and then silence, it does not work. The thought immediately comes to mind, maybe the controller is not turned on, let's take it and check it, it is.

Each PC has a device manager that shows which devices are connected, whether all drivers are installed and updates are made.

In general, I think that you probably already know that in the absence of any driver, the system automatically marks it with a yellow exclamation mark, this means a malfunction, as a result, with two mouse clicks, an additional window opens, information about the code is displayed here malfunctions and the possibility of its recovery.

Ninth, if all of the above methods did not give a positive result, then I recommend that you install a USB PC controller on the motherboard.

If your computer has a low-power power supply, for example, 300 W, then it is likely that the cause of all the troubles is hidden in it, install a more powerful power supply, say 500 W, and check if the USB ports are working.

Concluding today's article, I would like to say that it is not always possible to easily find the culprit of all problems, sometimes it is not enough just to reinstall Windows to find out what really happened.

If there are no drivers for the serial bus controllers and the controllers themselves are marked with an exclamation mark, then you should either install the drivers for the controller, or you can remove all the controllers and restart the computer. After the computer boots, the system will try to install them again, and it is possible that all USB ports will work properly again.

Restarting the computer
If for some reason all USB ports have ceased to function, and USB devices are not detected, then for a start it will be enough just to reboot the system unit. Perhaps this procedure will be eliminated immediately. This can happen if there were no problems loading the drivers.

Update hardware configuration in device manager
A situation may arise when restarting the computer is not possible, because it performs some important operations. That is why, without rebooting the entire computer, you can only reboot the driver. This can be done through the "Device Manager". To take this action, just right-click on the label "My Computer" select "Manage".

In the window that appears as a result of this, you need to click on the "Action" tab, after which you need to click "Update hardware configuration". If, as a result of this procedure, the “USB Controllers” section appeared, then the problem is completely resolved, and USB will continue to function.

Disabling the USB controller
There is one great way to get the USB ports to function. To do this, disable and reinstall the USB controllers. You should immediately launch the same "Device Manager". A list of equipment will be displayed in a new window, and from it you need to find the USB controllers section. Next, you need to select and remove each of these devices. After all devices are removed, be sure to restart your computer. This will reset the controllers so the USB ports are available again.

USB Controllers: Driver Update
The USB controller drivers may be corrupted and therefore the USB ports will not work. In such a situation, the only correct way out is to find and reinstall the correct drivers. To do this procedure correctly, you should find out the manufacturer of the USB port, because you need to download the appropriate driver. If you manage to complete this task, then installing the driver will solve the problem in an instant.

Disconnecting other USB devices
Of course, situations may arise when many USB devices are connected, and the laptop will simply be overloaded. Not always the power supply may be enough for all connected devices.

Entering BIOS settings

To start changing the configuration, you need to get into the corresponding menu. It can be opened when the personal computer is turned on - before Windows starts loading from the hard drive.

Turn on the PC. In case it's already running: reboot. Wait for the speaker to beep: a short single beep indicates that all the internal components necessary for the operation of the computer have been detected.

Now you need to press a hotkey to call the configuration. This must be done before changing the screen. If you didn’t have time, and Windows started loading, reboot. The keys depend on the installed motherboard model and BIOS firmware version. You can find it in the user manual that came with the motherboard, on the official website of the manufacturer, or look at the screen of your PC when it boots up:

PC screen on boot

If you don't know the board model, it's okay. Just try pressing the following keys: Tab, Delete, Esc, F1, F2, F8, F10, F11, F12. One of them will definitely fit.

It is not necessary to try only 1 option at a time. You can quickly click all the buttons from the list without any problems. One of them will come up and start the BIOS settings, and the rest will be ignored.

Entering the BIOS/UEFI settings of the latest PCs

Many modern computers boot up so quickly that it is impossible to get into the keystroke method when turning on. This is also true for laptops. Therefore, the latest versions of Windows have acquired a new launch feature. Let's use Windows 8.1 as an example.
Swipe the mouse from top-down or bottom-up along the right edge of the screen and in the window that appears, click "Options".
Click on "Change PC settings"
Click "Update and Recovery". Reboot in Special Mode
Next: Recovery.
In the Special Boot Options section, click the Restart Now button.

Your PC or laptop will restart in setup mode. Once your PC restarts, you will also be able to choose to run from a USB stick or DVD.

Menu navigation

Almost all BIOS versions lack a graphical interface. This means that you will only have to work using the keyboard, as, for example, in the Windows console. Navigation is carried out using the up-down and right-left arrows. To open any section, use the Enter key to go back - "Escape". A small memo on the keys used is always shown on the screen.

The UEFI firmware suite is installed on the most expensive and powerful motherboards. It supports more drivers and can work with a mouse. Its interface will be familiar to users of Windows and other modern operating systems.

Each version has its own interface and set of options. Even the names of the same parameters may differ. The following article describes several popular BIOS releases.

A very common option that can be found on many modern computers. The main menu is divided into 2 parts: a list of categories and various actions like exit or save. You will work on the left side.

You need to go to the section called "Integrated Peripherals". There is no Russian version of the interface, so all commands are in English only. Use the down arrow to highlight this item and press Enter.

Here you need to enable (Enabled) 4 options:

USB EHCI controller is the main controller. If the motherboard has version 3.0 ports, this item will be divided into 2 parts: "Controller" and "Controller 2.0";
USB Keyboard Support - support for keyboards;
USB Mouse Support - mouse support;
Legacy USB storage detect - work with external data storage: flash drives, disk drives, disks of smartphones and digital cameras.

In some older versions, there are only 2 items "USB controller" and "Legacy USB storage support".

When you're done with the settings, press the F10 key to save your changes and restart your computer.

Phoenix AwardBIOS
Another popular version that can often be found on modern laptops. It does not have a main page, like AMI, but is equipped with convenient thematic tabs at the top. You can move between sections using the "left" - "right" arrows, and between items - using the "up" and "down" arrows.

Go to the "Advanced" section using the "Right" arrow. In it, find the category "USB configuration". All items in this section must be moved to the “Enabled” position. In some versions, the category "USB configuration" may be in the "Peripherals" tab and not in "Advanced".

To exit the menu, press F10 and confirm exit.

AMI BIOS for Asus
AMI version used on Asus laptops. Outwardly, it is very similar to Phoenix - a similar bookmarks bar. The USB settings are in the "Advanced" section. Go there, enable all options and exit with the F10 button.

UEFI
Contrary to popular belief, UEFI is not part of the BIOS. It can rather be called a more advanced, but less popular competitor. There are a large number of different versions, each with its own interfaces. However, here the control is similar to the familiar Windows, so you can easily find the options you need.

Windows Settings
If at the BIOS level all ports and controllers are enabled, but the USB ports still do not work, the problem may be in the settings of your Windows system.

First, try simply disconnecting and reconnecting the device. This will cause the drivers to be validated. If something is wrong with them, Windows will try to reinstall them.

If nothing happens when you reconnect, try enabling the controller in the Windows registry. To do this, do the following:

Call the "Run" dialog using Win + R (or via "Start": in XP and 7-ke by clicking on it with the left mouse button, and in 8 and 10 versions - with the right mouse button). Enter regedit
Enter
regedit
and click OK.
Navigate to "HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services USBSTOR".Registry Editor
Double click on the "Start" entry to open the editing window.
Change the value to "3". With any other parameter values, USB ports will not work.

Hello dear readers! Every time you start the computer, all devices installed in the computer are initialized, data about drivers and various utilities are read. But, sometimes there comes a time when the device connected to the personal computer is not detected by the operating system.

It is at this moment that we have an anxious moment, and we ask ourselves: why does not workUSBport? What exactly is the matter and what needs to be done to make the port work? In the end, as they say, there is a way out. But first, let's figure out how everything works and what the essence of this material is.

So, many of us, when working at a computer, use the USB port all the time, as if it is impossible to do without it, although in fact it is. In computers, as you know, USB ports are present not only on the front panel, but they can also be seen on the front panel of the system unit case, for example, in a card reader.

So now the USB port is the heart of the system, so to speak, the exchange of information that can be transferred at any time to the PC system available at that time. I am already silent about the fact that with the help of ports it is possible to enter data into a computer (mouse, keyboard). The location of ports on a personal PC is always different, it is worth adding that in advanced systems, gaming platforms, additional USB ports are installed.

As always, as it usually happens, one fine day there comes a moment when the USB port does not work, that is, the USB port simply hangs, is buggy, is not detected by the system, or rather, it does not work correctly. I suggest that in today's article you consider the causes, as well as ways to fix a non-working USB port.

We wonder why the USB port does not work?

Firstly, if when you connect a flash drive to a computer or some other equipment, the port does not work quite correctly or the device connected to the computer is not detected by the system at all, then in this case you should make sure that the controller on the motherboard PC is turned on .

Quite often, users forget to turn on the USB controller. It seems to be a simple, but still common problem when the user started the PC, but the device was not detected. It is possible to fix everything here, for this you need to go into the BIOS and enable the corresponding parameter. By the way, if you do not know what BIOS is, then I recommend that you definitely read the article

So, go to the BIOS, find the item “Integrated Peripherals - this applies to the Award BIOS”, or in the Ami BIOS - Advanced”.

Next, press "Enter" and go to "Onboard Devices Configuration" and make sure that the items "USB Function" and "USB 2.0 Controller" are in the "Enabled" position. If so, then everything is included. Otherwise, the parameter can be turned off (OFF), position "Disabled". If the option is disabled, then enable it. Next, save the changes, then reboot the PC system and check the USB port is working. Be sure to check if the USB ports on the front panel of the system unit are connected to the motherboard itself using the so-called block.

If the port still does not work, then move on.

Secondly, or maybe it's the inoperability of the port and is completely hidden in the USB extension cable? For example, there are situations when the computer does not recognize a peripheral device (printer), for the simple reason that the USB cable itself is simply damaged. The reason for cable damage can be very diverse, for example, you accidentally put a chair on a cable or some heavy object and simply pinched it. Therefore, do not be too lazy to check the cable itself.

Thirdly, it is quite rare to encounter such a problem when the USB port does not have enough power. I will give you a specific example. Imagine that you have connected a USB flash drive and a printer to the front of the case of the system unit in the USB connector. As a result, the operating system, when sending data for printing, informs us that the document could not be printed. In general, your computer simply does not see the printer. And if you restart your computer, the printer is detected by the system, and you can easily print a document. However, after a while, the computer loses its connection to the printer again and the printer does not print. Do you know why?

Such a seemingly banal problem at first glance is due to the fact that there was a lack of power for the USB port. As a result, the USB port refuses to function properly. Basically, such an incident associated with a lack of power occurs when connecting several devices to the front panel USB ports.

Of course, not always, but such situations do occur. These USB ports are connected to the motherboard with a cable. This cable, in addition to data transfer, also provides power to the USB hubs themselves. It is possible that the power supplied to two devices connected to the USB hub at the same time may not be enough. In this case, I can recommend that you connect the printer to the built-in USB port, which is located on the PC motherboard.

You can also change the CMOS battery on the board. It happens that the problem disappears completely after replacing the battery on the motherboard. What is this battery and where is it, you can find out in this article:

In general, if you does not workUSB port, which is located on the front panel of the system unit case, then try to replace the USB hub itself. Who knows, maybe it is he who is faulty.

You can also try plugging the cable into a different USB port on the motherboard.

Fourth if, nevertheless, the USB port controller, which is responsible for detecting and starting the device itself, fails, then things are, of course, bad. There is, of course, the opportunity to take and solder the controller itself on the motherboard, but this takes time, you need to have the controller itself, and, of course, the soldering station itself. From the point of view of time costs, it is not quite reasonable. Another option is to entrust it to specialists, although there are also some pitfalls here, the price, the quality of work, as well as the competence of a specialist who specifically works on this problem.

Fifth, peripherals and mobile devices may not be recognized on your computer due to the lack of drivers and special software. It cannot be ruled out that if you have been using your operating system for quite a long time and the system has not been updated at all, and indeed the Windows assembly is not the original version, then in this case it is the case that the drivers are already considered outdated and therefore the system freezes happen all the time.

Sometimes Windows disables the USB hub altogether to save power. To prevent the USB device from being disconnected, you need to do the following.

Open the "Device Manager" by right-clicking on the "Computer" icon and selecting "Properties".

After the Device Manager window has opened, double-click the left mouse button on "USB Controllers", expand the branch.

Now you just have to go to the root USB hub and uncheck the box in the "Power Management" section, as shown in the figure below.

At sixth, sometimes reinstalling the operating system helps fix the problem when does not workUSBport. Although, of course, first try to roll back the system to a previous state. Here is an article that will show you how to do it:

Seventh, perhaps your system has some kind of faulty equipment, which just the same serves as an obstacle to the normal operation of the USB port.

This problem is very relevant in our time. After all, quite often users directly encounter this. So, there is a solution. USB ports can hang on the computer, contacts can close, and many more additional problems can occur when working at the computer.

We find a way out of our situation, check all devices for connection and disconnection. You will need to disconnect all devices and connect one at a time, for example, connect the keyboard first and see if it works, then connect the next device, let it be a mouse and so on. Connect additional USB devices, if they don’t work, then the problem is solved or you need to look in peripheral devices, maybe something is shorting there, but you never know.

Eighth, generally forgot to enable the serial bus controller in the device manager. There are moments when you do not pay attention to the work of USB devices, turn on the computer, download music, listen and enjoy new works of art. True, everything comes unexpectedly, suddenly a USB device was needed, and then silence, it does not work. The thought immediately comes to mind, maybe the controller is not turned on, let's take it and check it, it is.

Each PC has a device manager that shows which devices are connected, whether all drivers are installed and updates are made.

In general, I think that you probably already know that in the absence of any driver, the system automatically marks it with a yellow exclamation mark, this means a malfunction, as a result, with two mouse clicks, an additional window opens, information about the code is displayed here malfunctions and the possibility of its recovery.

Ninth If all of the above methods did not give a positive result, then I recommend that you install a USB PC controller on the motherboard.

If your computer has a low-power power supply, for example, 300 W, then it is likely that the cause of all the troubles is hidden in it, install a more powerful power supply, say 500 W, and check if the USB ports are working.

Concluding today's article, I would like to say that it is not always possible to easily find the culprit of all problems, sometimes it is not enough just to reinstall Windows to find out what really happened.

If there are no drivers for the serial bus controllers and the controllers themselves are marked with an exclamation mark, then you should either install the drivers for the controller, or you can remove all the controllers and restart the computer. After the computer boots, the system will try to install them again, and it is possible that all USB ports will work properly again.

So, summing up today's article, we can only note that if the USB port on the computer does not work, then the cause of all troubles can lie in both hardware and software stuffing. In general, everything I wanted to tell you about today, I have said.

How do you like today's article and what can you add to all of the above? In the next issue you will find out =>

USB technology is one of the most important of the many technologies that have had a huge impact on the computing world. USB (Universal Serial Bus- "universal serial bus") - a serial data transfer interface for low-speed and medium-speed computer peripheral devices

This technology has made it really easy and convenient to work with printers, scanners and external storage devices (external hard drives, USB flash drives). All actions with the installation of USB devices have been reduced to a simple principle " Plug and Play". Truly mobile, devices have become precisely because of USB technology. USB ports today are equipped not only with desktop PCs and laptops, but also with gaming devices, smartphones, cameras, navigators and many other devices.

Ports USB version 2.0 provide data transfer at speeds up to 480 Mbps, and the version USB 3.0 raises the maximum transfer rate to 5.0 Gbps. The USB symbol is a kind of trident, drawn both on USB devices and on computer connectors.

USB technology has been studied enough and has gone through many improvements, so USB ports, when used correctly, rarely cause any problems, and troubleshooting related problems is not much of a hassle. This article will outline the basic principles of troubleshooting USB ports.

But before we begin, it is worth describing basic recommendations when working with USB ports and devices connected to them:

- never connect devices with visible mechanical damage to the USB connectors, as well as devices with external damage to the case or with a clear smell of burning.

If the USB ports on the motherboard are mechanically damaged, then it is better to disconnect them from the motherboard (connectors in the front of the case) or seal them with colored tape to prevent their use. If possible, it is better to replace such ports in the workshop with new ones.

Try not to overload USB ports. Their current strength is strictly limited: 500 mA for USB 2.0 and 900 mA for version 3.0. Don't try to increase the number of USB ports with different USB multipliers. Modern motherboards already have up to 10 ports, which is enough for home use. It is always safer to buy an additional PCI or PCIe USB controller than to work through a USB tee.

If USB ports stop working on a laptop, then work on it becomes very difficult - do not connect a printer, scanner, or USB flash drive. And unlike a desktop computer, installing an additional USB controller is very expensive.

In many cases, when you receive the error message " USB device not recognized » The problem may be in the USB port. This problem is usually solved quite easily, since it occurs mainly at the program level.

What to do if the USB ports do not work?

Any hardware device interacts with the installed operating system through a special program - driver. Many problems with devices are solved with the help of drivers. The same is true for non-working USB ports. Below are a few methods that will help you troubleshoot USB ports at the software level.

If USB ports suddenly stop working, and USB devices are not detected, then the easiest way to fix this sudden problem is to restart the computer. Just restart your computer. If there were no problems loading the drivers, then this problem will be fixed after a reboot.

Update hardware configuration in Device Manager

If restarting the computer is not desirable at the moment (for example, due to some important operation), then you can “reload” the drivers without restarting the entire computer via Device Manager. To launch it on the shortcut " My computer» right-click and select the menu item « Management e". Or in the menu Start» find the program « Run” and after launching it, enter the command devmgmt.msc.

In the window that opens, left-click once on the list of devices and then click on the tab " Action", then point to " Update hardware configuration". See if the section " USB controllers". If yes, then your problem is solved, USB ports should work.

Another way to get the USB ports working is to disable and then reinstall the USB controller. To do this, you need to run again Device Manager. In the list of equipment that you will see in the window that opens, find the USB controllers section. On each of the devices in this section, right-click and uninstall them all. Once you have removed all controllers, simply restart your computer. The controllers will be reinstalled and the USB ports will be available again. This may solve your problem.

Update USB Controller Drivers

Another reason for USB ports not working is corrupted USB controller drivers. The only way out is to find the correct drivers and reinstall them. To download the appropriate driver, you need to find out the manufacturer of the USB device port (through it). Installing the correct driver should fix this issue in an instant.

Disconnecting other USB devices

Sometimes USB ports don't work because they get overloaded when too many USB devices are connected. USB hubs sometimes do not provide enough power for devices connected to it. The connected device may consume all the allowed power of the computer's USB controllers. If the equipment is connected to a USB hub, simply plug the device directly into a USB port on your computer.

You can also leave the device connected to the USB hub, but first disconnect other devices on the hub. For the future, purchase a USB hub with its own power supply that will provide sufficient power to all devices connected to it.

If none of the above methods worked, then it is likely that the USB ports have been physically damaged. Or the USB controller is damaged, in particular the south bridge of the motherboard. In this case, the best thing you can do is to have the USB port controller replaced or repaired at a service center.

USB technology is one of the most important of the vast number of technologies that have had a major impact on the computing world. USB (stands for Universal Serial Bus) is a serial interface designed to transfer data to medium and low speed computer peripheral devices.

This technology has made working with scanners, printers, as well as external devices (USB flash drives, external hard drives) really easy and convenient. All actions related to the installation of USB devices are reduced to the "Plug and use" principle. These devices have become truly mobile thanks to USB technology. To date, USB ports are equipped with laptops, desktop PCs, as well as various gaming devices, cameras, smartphones, navigators, TVs and other devices.

USB 2.0 ports transfer data at speeds up to 480 Mbps, in the USB 3.0 version, the maximum transfer rate rises to 5 Gbps. The USB symbol is a kind of trident, which is drawn on both USB devices and computer connectors.

This technology has already been studied enough and has undergone many improvements, and therefore USB ports rarely cause any problems when used correctly, and troubleshooting associated with them causes little hassle. In this article, we will look at the basic principles of troubleshooting any problems that may arise with USB ports.

• if the USB ports on the motherboard are mechanically damaged, then they should be disconnected from the motherboard (connectors on the front of the case) or sealed with tape so that they are not used. Such ports at the first opportunity should be replaced with new ones in the workshop.
• do not connect devices if there is visible mechanical damage to the USB connectors, and do not connect devices if there is external damage to the case, or there is a burning smell.
• do not overload USB ports. In them, the current strength is limited: for USB 2.0 - 500 mA, for 3.0 - 900 mA. Do not increase the number of USB ports with different USB multipliers. New motherboards have up to 10 ports, which is quite enough. It is more reliable to purchase an additional PCIe or PCI USB controller than to work through a USB “tee”.
• before connecting USB, in order to remove static voltage, it is recommended to touch the grounded case of the system unit. Static discharges are often the main reason why USB devices fail.

If the USB ports stop working on a laptop, then it becomes very difficult to work on it - you can’t connect a scanner, a printer, or a USB flash drive. Unlike desktop computers, installing an additional USB controller is quite expensive.

When an error message like this "USB device not recognized" appears, in most cases, the problem may be with the USB port. This problem is solved quite easily, because it occurs at the program level.

Any hardware device through the driver interacts with the operating system. Most device problems are solved with the help of drivers. This also applies to non-working USB ports. Below we will look at several ways to help troubleshoot USB ports at the software level.

Restart your computer

If the ports suddenly stop working, and the computer does not detect the USB device, then the easiest way to fix a sudden problem is to restart the computer. Restart your computer. If there were no problems when loading the drivers, then such a malfunction will be eliminated after a reboot.

Update in Hardware Configuration Device Manager

If at the moment restarting the computer is not desirable (for example, some important operation is being performed), then without restarting the entire computer, you can “restart” the driver using the Device Manager. To launch it, you need to right-click on the shortcut "My Computer" and select "Manage". Or go to the Start menu and find the Run program there, launch it, and then enter the devmgmt.msc command in the field.

A window will open in front of you, where you need to left-click once on the list of devices, then click the “Action” tab in the main menu and point to the “Update hardware configuration” button. The USB controllers section should appear in the list of devices. If it appears, then your problem has been solved, and the USB ports should work.

Disabling the USB controller

Another way to get the USB ports working is to disable and then reinstall the USB controller. To do this, launch the Device Manager. We find the USB controllers section in the list of equipment. In this section, on each of the devices, right-click, then delete them all. After all controllers have been removed, restart your computer. The controllers will reinstall and the USB ports will become available again.

Update USB Controller Drivers

The reason for the inoperability of USB ports may be damage to the USB controller drivers. The way out is to find the correct drivers and reinstall them. To download the appropriate drivers, you need to find out the manufacturer of a specific USB device port. By installing the correct driver, the issue should be resolved immediately.

Disconnecting other USB devices

It happens that USB ports do not work due to being overloaded when a lot of USB devices are connected. USB hubs sometimes do not provide enough power to connected devices. Some connected device can use the full power of the USB controllers. If the equipment is connected to a USB hub, then reconnect the device to the USB port directly.

You can leave the device connected to the USB hub, but you must first disconnect other devices on the hub. Purchase a USB hub that has its own power supply that will provide sufficient power to all devices connected to it.

If none of the above methods helped you, then most likely the USB ports are physically damaged. Either the USB controller is damaged, the south bridge on the motherboard, in particular. In this case, it is best to repair or replace the USB port controller at the service center.

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USB connectors rarely break and are very picky in handling. But when they fail, it causes a lot of trouble. In this article, we will present to your attention the simplest solutions to this unpleasant issue.

To get started, restart your computer. Sometimes there are situations when drivers stop working due to some kind of system error. So restarting the system can fix this situation. If it is not possible to restart the PC, for example, due to the robots of some important program (say, installing an application), you can try reloading the drivers. To do this, follow the path "Start - Control Panel - Task Manager" or enter "Start", click "Run" and enter "devmgmt.msc" in the field. In the new window, select "Action", and then "Update hardware configuration". If the USB controller appears in the list, then the problem is solved. You can also try uninstalling and reinstalling the controller. Let's just say that this method works very rarely, but in some cases it really helps. Go back to Device Manager. Find the USB connectors section, and by clicking the right mouse button, delete them. After restarting the computer, when the OS boots up, the new drivers will be installed themselves. In some cases, the malfunction will be caused by damage to the drivers themselves, and therefore they need to be updated. But this process is quite complicated, and it is better not to do anything yourself, but to contact a specialist.

One of the most common faults is overloaded USB ports. In other words, a lot of all sorts of cables are connected to the computer. The solution to this problem is very simple: you need to disconnect all the cords and leave only the one you need.

Also, the reason why the controller does not work may be "BIOS". The next time you start your computer, press the BIOS entry key (usually delete, F1, or F10). After logging in, go to the "Advanced" section and find the item "USB Controller". This line should be “Enabled”, and if it’s different, then change it to the one you need and save. If none of the above methods helped, then this is definitely mechanical damage to the connector or connection cable. First you need to establish what specifically does not work. Disconnect all cables from the USB connectors, turn on the computer again and start returning it one by one, so you can find out which connector or device is not working. After a non-working device is found, carefully examine for damage: is there any dust on it, is it whole or not, and if there are any cracks. After that, also look at the connecting cord: is it not strongly bent, is it torn, are there any cracks, chips or cuts.