Computer or laptop motherboard chipset failure.
This type of failure is most often found as a secondary failure, when the contacts of the USB connector are short-circuited by the destruction of the plastic connector.
To be performed in the workshop. Only a professional technician can give the exact diagnosis.
As a diagnostic alternative (and what if it is not the bridge failed). ) You may be offered to reinstall Windows and install the native drivers (from the manufacturer’s website) for the chip and USB. Then recheck the functionality.
This helps to rule out the following types of errors during the installation of drivers.
USB in case of chipset motherboard failure is made in the workshop with the help of soldering station and “steady hands” of experienced master. New chip is prepared, the old one is removed and the new one is soldered in its place.
Incorrect BIOS configuration
In the list of ways to solve the problem with USB ports you can find the BIOS check.
Sometimes this procedure can be used to enable the controllers on the motherboard which disconnect on their own.
To activate it, you need to complete several steps:
- Reboot the system by pressing the function keys to enter BIOS (F1 or F2 for some laptops). for others. Del or Esc ).
- Select Advanced or Integrated Peripherals.
- Go to the USB Configuration menu and change the value in the USB Controller section (there are more than one and with different names) to Enabled.
At this point, you should save the changes of the interface (usually F10) and exit.
After rebooting the hardware configuration of the laptop will change and USB ports which were not previously recognized by the system may turn out to be working.
USB Ports Stop Working.
USB technology is one of the most important of the many technologies used to exchange information, nowadays. This technology has made it really easy and convenient to work with printers, scanners and external storage devices (external hard drives, USB flash drives). The USB devices have been reduced to the simple plug-and-play principle. Not only desktop and notebook PCs, but also gaming devices, smartphones, cameras, navigation devices and more are equipped with USB ports today.
USB Version 2 Ports.The USB 3.0 series offers data transfer rates of up to 480 Mbps, and the USB 3.0 version offers data transfer speeds of up to 10,000 Mbps.0 raises the maximum transfer rate up to 5.0 Gb/s. The USB symbol is a kind of trident, drawn both on USB devices and on computer connectors.
Occasionally users find that their USB ports suddenly stop working. Before you take your device to the repair shop and pay for it, you can try to repair USB by yourself.
But before we begin, it is worth describing the basic recommendations for working with USB ports and the devices connected to them:
Never connect devices with visible mechanical damage of USB connectors, as well as devices with external damage to the housing or with a clear smell of burning.
if the USB ports on the motherboard have mechanical damage, it is better to disconnect them from the motherboard (connectors in the front of the case) or tape them to prevent their use. If convenient, it is better to replace such ports in the workshop with new ones.
Try not to overload the USB ports. Their current draw is strictly limited to 500mA for USB 2.0 and 900mA for version 3.0. No need to strive to increase the number of USB ports with different USB multipliers. Modern motherboards already have up to 10 ports, which is quite enough for home use. It is always safer to buy an extra PCI or PCIe USB controller than to work through a USB “T-bar.
Before connecting it is recommended to touch the grounded case of the system unit to remove static voltages. Static discharges are the main reason of USB devices hardware failure.
If your notebook does not work, then working on it becomes very complicated. you can not connect your printer, scanner, or USB flash drive. And unlike a desktop computer, installing an additional USB controller is very expensive.
In many cases, when you see the error message “USB device not recognized” error message appears, the problem may be in the USB port. This problem is usually solved quite easily, since it occurs mainly at the software level.
What to do if the USB ports do not work?
Any hardware device interacts with the installed operating system through a special driver program. Many problems with devices can be solved with the help of drivers. The same is true when the USB ports are not working. Here are a few ways to help you troubleshoot USB ports at the software level.
Just reboot Computer
If USB ports are not working and USB devices are not detected then the easiest way to solve this sudden problem is to reboot the computer. Just reboot the computer. If there is no problem to load the drivers, then this problem will be solved after rebooting.
Updating the hardware configuration in the Device Manager
If restarting the computer at the moment is not desirable (e.g. because of some important operation), you can “restart” the drivers without restarting the whole computer through Device Manager. To start it, right click on the ” My Computer ” icon and select the ” Management ” menu item. Or you can run “Run” from the Start menu and after running it enter devmgmt.msc.
In the window that opens, left-click once on the list of devices and then click on the Action tab in the main menu, then point to Update Hardware Configuration”. Check if “USB Controllers” appears in the device list. If yes, then our problem is solved, the USB ports should work.
Unplugging the USB controller
Another way to get the USB ports to work is to unplug and then reinstall the USB controller. To do this you will need to run Device Manager again. In the Hardware list, find the USB controllers section. On each of the devices in that section right-click and remove them all.
IMPORTANT! (If you have a mouse or keyboard plugged into USB, they will stop working if you remove some driver from this list. After restarting the computer everything will be fine again.)
After uninstalling the controllers, you just need to restart the computer. The controllers will be reinstalled and the USB ports will be accessible again. This might solve the problem.
Updating USB controller drivers
Another reason the USB ports do not work is that the USB controller drivers are corrupt. The only solution is to find the correct drivers and reinstall them. To load the appropriate driver, you need to find out the manufacturer of the USB device port (by its device instance code). Installing the right driver should immediately solve this problem.
Fix the registry
IMPORTANT! (If you are not an advanced PC user I would not recommend trying this option.)
Go to the “Start” menu, click on “Run” and after running it, enter regedit.exe.
Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ControlClass\ folder
Look there for the LowerFilters and UpperFilters settings. If they are present, you will have to remove them.
Disable other USB devices
Sometimes the USB ports do not work because they are overloaded, when you have too many USB devices plugged in. USB hubs sometimes do not provide enough power for the devices connected to them. Connected device may consume all allowed power of USB controllers of the computer. If the equipment is connected to the USB hub, you can simply connect the device directly to the USB port on the computer.
You can also leave the device connected to the USB hub, but first disconnect the other devices in the hub. For the future, you can buy a USB hub with its own power supply, which will provide sufficient power to all devices connected to it.
If none of the above methods help, it is likely that the USB ports were physically damaged. Or the USB controller, particularly the motherboard’s South Bridge, is damaged. In that case the best thing you can do is to have the USB ports controller replaced or repaired at a service center.
USB does not work in Windows 10
Now a lot of people complain that after updating to the 10-th version of Windows, some of the usual functions and programs stop working correctly. In particular, many USB ports stop working fully or partially. Some argue that it is crappy drivers and software, some blame power shortage, allegedly the new software is more demanding to the consumption of energy and power supply capacity is sometimes simply not enough. The exact answer and a solution to the problem have not yet been found too little time has passed since the release. One thing for sure, if you have experienced any bugs or problems after a Windows update before trying other options, be sure to install all official updates from the developers.
And of course, if you are having difficulties, you can always write about it and try to solve the problem together =)
Find the DisableSelectiveSuspend registry key
If the USB ports still don’t work then we go one step further and make some changes in the registry editor.
To go to the registry editor, press Win R. type regedit. and press the “Enter ” key. This will open the registry editor window.
Next 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 “.
Enter in field “Value ” the number 1. That way you will disable the selective suspend function and power will be constantly supplied to your USB ports.
It often happens with laptops that the USB controllers are disabled when running on battery power only. But it is possible to disable this setting. Also this problem sometimes occurs with PCs for some reason, if again, the power supply is not enough to handle more devices.
- There will be several variants of the electricity plan. It is best to set it to “Balanced” or “High Performance. If you are afraid to change something, on the current plan, go to “Power Plan Setup”.
- Scroll to the section with USB and open it, you need to set the temporary disconnection parameter to “Forbidden”. In laptops will be two options: from the network, and from the battery. in both cases, set the ban.
If you are sure that before reinstalling Windows all USB ports on your computer or laptop were working, and then stopped, then the most likely cause is the lack of drivers for the controller, responsible for USB connections.
However, some ports may work, namely the USB 3.0 (blue) do not work.
To make sure that the problem is in the drivers, you must go to the device manager and look for devices without a driver. Usually these devices are marked with an exclamation mark or a question mark.
To enter the Device Manager in Windows 7, right-click on the Computer icon and in the menu that appears, select Manage.
Then in the opened window on the left choose Device Manager.
Go to Device Manager from Computer Management
The right side of the window will display all devices on your computer. There must be at least one device with an exclamation mark or question mark among them.
Remove USB Host Controller
Next, proceed carefully. If you are working on a PC, then most likely you have a USB mouse and keyboard plugged in. Once you remove the USB Host Controller, your mouse and keyboard will be disabled. This is not a problem since they will work again after restarting your computer.
So, as you have understood you need to right click on the USB Host Controller, and select Uninstall. Perform this action for all devices named USB Host Controller.
After uninstalling USB Host Controller, restart your computer or laptop. After restarting, computer will automatically install necessary drivers for USB ports.
Checking BIOS Configuration
The first thing to check in case of such a problem is whether the USB adapters on the motherboard. They can shut down on their own and you do not need to repair the connector. When the controller suddenly stops working you can reactivate it in the BIOS:
- Just after booting up often press Del, F2 or whatever function key is provided to enter BIOS on your device.
- Find Integrated Peripherals or Advanced (depending on the BIOS version).
- Select USB Configuration. Here the Enabled option must be set against the USB Controller. If it is absent set it yourself and save the current configuration.
The problem can also sometimes be caused by a USB device that needs to be repaired. To define it, disconnect all devices that use this port. mouse, USB keyboard, etc. д. Try connecting a working flash drive. If problems stop appearing, look for a dead peripheral.
Working with the Device Manager
Use Start or another way to access Device Manager. Possibly one of the USB controller group here is marked with yellow exclamation mark icon, and that is why the device is not working.
You may try to correct the situation in the following way:
The next time the system restarts, it will reinstall the software and those controllers that failed may start again. Sometimes it helps to roll back OS to a previous state, when all devices were properly functioning.
USB can be disconnected due to system settings
The laptop‘s power management can be configured in such a way that the system itself disconnects the USB connector after a certain period of inactivity to save battery power. No repairs are needed here. To stop the laptop from disabling the USB input, simply do not allow Windows to change the controller’s power settings:
- In the Manager, open the Serial Bus Controllers branch, highlight the USB Root Hub line.
- Double-click to open the device, select power management.
- Uncheck the box that allows the system to disable the connector to save power.
Repeat the above steps for each USB hub listed in Device Manager.
Deactivate USB temporary shutdown
The detection of USB devices may be affected by the power management settings, especially if you have a laptop. The USB temporary shutdown feature is designed to reduce power consumption and usually works correctly. But it is also worth checking as a last resort.
- Type and select “Change the power management scheme” in the operating system search.
- In the window that opens, click “Change advanced power settings”.
- In the “USB Settings” category, you’ll find one or two items, depending on whether you have a desktop or laptop. Both should be set to “Disallowed.”.
- Save the settings and reboot the PC.
- From the Apple menu, choose “System Preferences.”.
- Open the “Power Saving” section.
- Uncheck “Put drives to sleep if possible” in “Battery” and “Network adapter” tabs.