There is no voltage on the usb ports of the computer. Why are the USB ports not working on my computer? Main reasons. USB ports on the front of the computer do not work
Causes of problems due to which they do not work USB port s on a laptop, can be completely different - from hardware failure to "flying" drivers motherboard or the controllers themselves.
However, usually the user can deal with most problems on his own, without contacting specialists - if he knows how to do it.
If there are a lot of USB ports on a laptop (for example, 3 or 4), the problem may not be so critical, and its solution can be postponed.
But if there are only 2 connectors or the constant need to use connected devices - flash drives, and even printers - the issue should be resolved as soon as possible.
Moreover, some methods will take no more than a few minutes.
First Troubleshooting Steps
The message that appears on the screen about the termination of the USB ports or the lack of reaction from the laptop to the drive installed in the appropriate slot may indicate.
Sometimes you can solve them with a normal reboot - there is a small chance that the fix will happen automatically.
Increase the likelihood of a positive reboot effect, which really helps sometimes, You can do it in an unusual way:
1 Completely disconnect the laptop from the mains (if it was, for example, charging);
2 Remove the battery and leave the laptop in this state for about 5 minutes;
3 Insert the battery back and turn on the device.
If no messages about idle ports appear on the screen, but the flash drive is still not readable or connected to a laptop peripheral device does not occur, it is possible that the problem lies precisely in this equipment.
The assumption is tested by connecting gadgets to other ports of the laptop - or another computer.
Other USB devices
Another one problem situation with USB ports occurs when a large number of external devices are connected to the laptop at the same time.
For example, the user has already connected three gadgets to four ports ( , and ), after which he tries to install a flash drive as well.
Sometimes such a drive simply will not be detected by the system - and turning off 1-2 peripheral devices allows you to check the assumption.
Simultaneous connection to a laptop of a large number of USB devices and adapters.
Most often, this situation does not occur when peripherals are connected directly to the laptop, but when using a "hub" (a USB hub that increases the number of connections).
You can solve the problem by reducing the number of connected devices - or even better, by removing the hub and connecting all gadgets directly.
Incorrect BIOS configuration
In the list of ways to solve the problem with USB ports, you can find.
Sometimes using this interface it turns out to turn on system board self-powered controllers.
Activation requires several steps:
- Reboot the system while pressing function keys to enter BIOS (for some laptops it's F1 or F2, for others it's Del or Esc).
- Select the Advanced or Integrated Peripherals section.
- Go to the USB Configuration menu item and change the parameter value in the USB Controller section (there may be several and with different names) to Enabled.
BIOS interface settings.
After rebooting, the hardware configuration on the laptop will change, and USB ports that were not recognized by the system before that may turn out to be working.
System settings
A battery-powered laptop may automatically turn off some controllers to save power - especially if it approaches critical values.
In this situation, first of all, you should connect the laptop to the network, and then change the power settings, by doing the following steps:
1 Open Device Manager.
2 Select the branch denoting serial bus controllers.
3 Find and open the USB Root Hub subkey.
4 Open the properties of the hub by double-clicking and go to the power settings.
If the problem was wrong settings power consumption, due to which the laptop automatically turned off the ports, there will be a check mark on the item that allows turning off the power of the hub.
By removing it, you can restore the functionality of the ports.
The steps are repeated for each hub if there are several on the laptop.
Prevent the system from turning off USB ports to save power.
Problem with drivers
The problem may be - and in most cases it is - in problems with USB drivers.
You can find the problem by going back to Device manager(via computer properties or by typing devmgmt.msc in mmc).
It is possible that one of the ports is marked in the list with a special icon - a yellow triangle with an exclamation mark, indicating a malfunction of the equipment.
The problem can be tried solve in one of 2 ways:
- Try updating the drivers (preferably an Internet connection) in the properties of the USB controller.
- Remove the device marked with a yellow triangle from Dispatcher And restart laptop.
When using the second option, the rebooted system will try to install new software for detected "new" hardware. Sometimes the operation of the port is restored.
For the first option, you may need to find out the ID number by which the Web searches for the corresponding driver - this identifier is located in the device properties on the details tab.
Determine the USB port ID.
The problem that the motherboard drivers do not work correctly (this usually happens with outdated laptops released several years ago) is solved by downloading and installing the appropriate software.
To do this, the laptop user must first find out - for example, use the AIDA64 application, which is paid, but also works without entering a key confirming payment for a certain trial period.
The name of the device will help identify and msinfo32 command, entered in the "Run" form (called by the keys Win + R).
Determine the name of the motherboard.
You can try to find drivers for the corresponding board on the website of its manufacturer - or on the resource of the company that developed the chipset.
You should know: In the absence of time and experience in finding and updating drivers, you can use the help of the utility. After installation on a laptop, it will independently check and update all the necessary software. The disadvantage of using this method is that, if you do not choose manual setting updates, the application will automatically replace the drivers for almost every detail and even update some programs - this usually takes several hours.
Utility for searching and updating control programs and other applications.
Incorrect operation of the operating system
Replacing this part returns the port (or several connectors at once) to its normal state.
In order to encounter such problems as rarely as possible, the user should not connect a large number of USB devices to the laptop - especially using special splitters ("hubs").
Also worth including automatic installation updates in the corresponding section of Windows - this usually allows the system to solve driver problems on its own.
It happens when USB ports stop working on computer. In this article, we will look at the common causes that lead to such a problem, and how to solve it. The very first thing to do is restart your computer, as frequent problems with USB ports are due to an error in the driver. If this method does not help, go ahead.
Perhaps the settings in the BIOS of the motherboard have gone astray. If the corresponding usb controller is disabled for some reason, it must be enabled. When starting the computer, press the Del or F2 key to get into the BIOS. Next, in the Integrated Peripherals or Advanced section, we will find a similar item on the USB Controller and look at what position it is in (Enabled - enabled, Disabled - disabled). So, if you have the Disabled mode set, change it to the opposite. To save the changes, press the F10 key and agree by pressing YES. After the reboot, the ports should work, if it doesn’t help then follow the steps below.
Reasons why USB ports on a PC do not work:
- any faulty USB devices A: I recommend turning on the computer, after turning off everything (mouse, keyboard, printer, webcam, etc. devices). Leave only one working flash drive. If the flash drive works when you start the computer, then the peripheral devices are to blame. You can determine which one is faulty by connecting it to a computer in turn.
- ports may not work due to faulty program code. We go to "Task Manager".
We carefully look in the paragraph "USB serial bus controllers", if there is a device with an exclamation mark, then this indicates that it is not working properly. Double-click to open it, and in the window you can read information about the malfunction.
- Alternatively, you can delete all controllers responsible for USB, and then reboot the system. After starting, Windows will automatically reinstall them. After that, it is likely that the USB ports will work.
- If the problem with the ports is due to a failure in program code, then you can try to restore the operating system, that is, roll it back to the last checkpoint. We go to the "Start" menu - "Control Panel". Here we find the section "Recovery".
Next, click the "Start System Restore" button. A recovery window will open and you can use the prompts to roll back the system.
- Also similar problem may appear due to the lack of a driver for the motherboard chipset. In this case, you need to drive this data on the manufacturer's website. After downloading and installing the driver, you should restart your computer.
- To make sure the problem is in the system or hardware, you can boot from any Live CD. If, after booting from such a disk / flash drive, the ports work, then the problem is definitely in the operating system and there is only one way out - to reinstall Windows. If USB does not work in the virtual system, then the problems are in the hardware. In this case, we do what is written below.
There was a case with a friend when they stopped working usb ports. Replacing the 3 volt battery on the motherboard solved the problem.
- Alternatively, you can update the BIOS. This solution helps many users. To update the BIOS, go to the official website of your motherboard manufacturer and in the "Download" section find latest version BIOS. There you will also find detailed instructions by update.
- If you have frequent problems with USB ports, I recommend installing a PCI-USB controller. Nice thing to be independent of your built-in ports.
- The last option is to send your PC in for repair, where professionals will probably make an accurate diagnosis.
That's all, friends! Thank you for your attention!
Quite often, people come to us with a question - why the USB ports on a laptop or computer do not work. USB ports may stop working after reinstalling Windows, after updating drivers, or at any inopportune moment. Of course, the problem may be a malfunctioning USB port, but before taking the laptop/computer to a service center, you should check the settings to make sure that the software is not the problem.
So, let's see what you can do in a situation where USB ports do not work on a computer or laptop.
Check USB ports
The first thing you need to do is check the USB ports for physical damage.
A simple test is as follows: insert a USB device into a port on a laptop and see if the connected device moves up and down easily. Be careful! You shouldn't pull hard on the USB port to avoid breaking it.
In case the USB port moves too freely, the problem is probably physical damage. You should contact the service center to replace the USB port.
To restart a computer
You can also try the good old method of any department technical support: turn off and on. Sometimes it really works because operating system rescans hardware, including USB ports, making them work.
If that doesn't work and the USB ports are still not working on your computer, then it's time to check Device Manager.
Check device manager
you can run device Manager in several ways, but we will talk about the fastest: press the Win + R keys, and enter devmgmt.msc. Click "OK" or key « Enter». Device Manager should immediately appear on your computer screen.
In this window, we are interested in the section " USB controllers". Click on the arrow next to this label to expand the section. You will see something like the window below:
Here you should find a device that has the words USB Host Controller in its title. For example, in my case it is Intel(R) 5-Series / 3400 Series Chipset Family USB Enhanced Host Controller. Some letters may differ for you, but in general you should have a similar device. If it just doesn't exist, this is probably the problem why the USB ports on the laptop don't work.
In this case, you should press right click on " USB controllers» and select "Update configuration". The computer will recheck the hardware and you will see the USB Host Controller listed.
Remove USB Host Controller
Next, you need to be careful. If you are working on a computer, then most likely you have connected USB mouse and keyboard. After you remove the USB Host Controller, your mouse and keyboard will not work. This is not a problem as they will work again after restarting the computer.
So, as you understand, you should right-click on the USB Host Controller device, and select " Delete". Perform this step for all devices named USB Host Controller.
After removing the USB Host Controller, restart your computer or laptop. After restarting, the computer will automatically install the necessary drivers for the USB ports to work.
Find registry key DisableSelectiveSuspend
If the USB ports are still not working, then we will go one step further and make some changes in the Registry Editor.
To go to the registry editor, press the keys Win+R, enter regedit, and press the " Enter". The registry editor window will open.
Next you need to find the registry key DisableSelectiveSuspend. It is located in the following folder: HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet -> Services -> USB. Next, in the right window, right-click on the file " DisableSelectiveSuspend", and select " Change».
In field " Meaning» enter number 1 . This way you will disable the selective suspend feature and power will always be supplied to your USB ports.
If there is no USB folder
If the USB folder doesn't exist in your registry, it's easy to create it. Just go to the Services folder, then on the toolbar click " Edit»> « Create»> « Chapter". name it USB.
Next select new usb section, right-click in the empty window on the right. You will only have the option " Create". Click on it and select the value " DWORD value (32-bit)". Enter the title DisableSelectiveSuspend.
As we wrote above, right-click and select "Edit". In the Value field, enter the number 1. You must restart your computer for the changes to take effect.
Ready! Our advice should help in a situation where the USB ports on the computer have stopped working. If you know other reasons why USB ports on a laptop do not work, and how to fix it, write in the comments below.
Peripheral devices such as a mouse, keyboard, webcam, printer are usually connected to the computer via USB ports. In this case, it often happens that one or more ports stop working. That is, when connected to a computer, for example, a flash drive, it is not recognized, the keyboard or mouse may freeze, and the printer may not respond and print pages.
There are several likely reasons why some or all of the USB ports on your computer are not working. Let's try to understand this issue and find out what should be done to restore the normal functioning of the computer.
Checking the BIOS settings
The first thing to pay attention to is BIOS settings computer. You will need a working keyboard to enter the BIOS. If the keyboard is connected to the computer via USB and it does not work, then you need to connect a keyboard with a PS / 2 connector. Otherwise, you simply cannot do anything.
So, we go into the BIOS, for which, when starting the computer, you must press the enter key, usually it is DEL. There may be another key that is displayed on the screen and is listed in the motherboard manual. After entering the BIOS, find the section responsible for the integrated devices (Integrated Peripherals) or the "Advanced" section. Here you should find the subsection “Onboard Devices Configuration”. It is in it that the parameters are responsible for USB operation controllers: USB Function or USB 2.0 Controller. These parameters must be enabled (Enabled). And if one of them is disabled (Disabled), then hover over it and press Enter, thereby enabling it. To prevent your changes from being reset, you must save them by pressing F10 and confirm the save by pressing the Y or Enter key.
After rebooting the computer, check if the USB ports are working. And if not, then you should look for the cause elsewhere.
USB ports on the front of the computer do not work
As a special case, USB only on the front panel may not work for you. In such a situation, it is necessary to check whether the necessary connectors on the motherboard are connected and whether the wires are damaged. For this we open side cover system unit and pay attention to the connector at the bottom of the motherboard. The board itself has the inscription USB1 or USB2, as well as on the block itself. The wires from the block go to the front panel, and if they are disconnected or broken in one place, then you have found the cause of the malfunction. Damaged wires should be connected or replaced. It will not be superfluous to check the contact in the connector on the motherboard. It is also worth paying attention to the board located on the front panel. Possibly takes place short circuit By the way, such a short circuit can be provoked by accumulated dust. So be sure to clean system unit from dust.
Problems with the device itself or the cable
The next source of USB problems can be the cable connected to, for example, a printer. This error is easy to identify and fix. We connect a USB flash drive to the checked connector. If it works, then we try to connect other known good equipment using a suspicious cable, for example, a USB hub. If it also refuses to work, then the reason is definitely in the cable and it should be replaced.
Power outages
There are situations when there is simply not enough power for all devices. For example, when connecting external hard A drive that uses two USB connectors at once may disable the printer or keyboard. In this case, the power of the power supply is not enough to provide energy to all consumers. In this case, the problem may not appear immediately, but after some time after turning on the computer. There are several ways out of the situation. If you have a low-power power supply installed, for example, 300 W, then it would be logical to change it to a more powerful one, 450-600 W. You can also use an active USB hub (with external power supply). It will allow not only to increase the number of connected USB devices, but also to power them from a separate power supply.
Another reason affecting USB performance is a dead CMOS battery. But at the same time, every time you turn on the computer, you will observe the system time and date that have gone astray. After replacing the battery, the problem goes away. But this is not common, so you should check other possible sources of malfunction.
Missing or incorrect installation of USB drivers
Reasons related to software malfunctions in Windows 7/10, can be detected using the Device Manager. If you notice that one or more devices specifically do not work, regardless of the port used, then this may indicate that the problem is in the device itself. Open the Control Panel and go to the Device Manager section. All connected devices will be displayed there. If there are items in the list that have yellow next to them Exclamation point or instead of the name there is an Unknown device, then the problem is in this very device. There may be several possible problems here.
Often USB inputs stop working after reinstalling Windows 7/10. The reason is incorrect installation drivers, or the necessary drivers may not be found at all. You will have to select and install manually.
Often, to fix a problem, you just need to update the driver. So, if automatic windows update, and the system itself was installed a long time ago, then the relevance of the software is lost, may appear system errors. At the same time, the device starts to work incorrectly, or even stops functioning altogether. To update (reinstall) drivers USB controller You can use the motherboard driver CD/DVD or download the required drivers from the motherboard manufacturer's website.
You can also turn off the power saving feature for all ports using the Device Manager. Expand the list of used USB devices hidden in the USB controllers, Mouse and other pointing devices, Keyboards sections. Double-click on the desired device to open the properties window. Now switch to the "Power Management" tab and uncheck "Allow the computer to turn off this device to save power." Thus, the device will be activated always and under any circumstances.
If some equipment is not recognized, then there may be a problem with the drivers already known to us, as well as a hardware problem, consisting in a lack of contact, cable damage, or a controller malfunction. Moreover, it often happens that when a faulty device is connected, the rest stop working normally. The keyboard starts to freeze, as does the mouse, and the printer stops printing. The problem is similar to a lack of power, that is, the consumption of all power goes to a faulty device, which may have an ordinary short circuit or other malfunction.
USB ports not working due to damaged controller
If none of the above actions helped restore the USB ports, then you should check the motherboard USB controller, which could have failed. High-quality repairs and diagnostics in this case should be entrusted to specialists. service center. As a way out of the problem, try installing an expansion board, the so-called USB PC controller, which is installed in the PCI slot on the motherboard. This solution is much cheaper than repairing the USB controller of the motherboard, and when using an additional USB hub, the problem with the lack of ports will not be relevant at all.
As you can see, finding and fixing problems with USB ports is a rather troublesome business, and all because there can be a lot of reasons. Consistently finding and eliminating obviously wrong paths will allow you to identify and fix the problem.