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How to fix 'A device attached to the system is not functioning' error?
How to fix 'A device attached to the system is not functioning' error?
Jul 24, 2025 am 02:16 AM
The solutions to the device's unrecognized solution are as follows: 1. Check whether the device itself is normal, check whether there is any damage or poor contact, and try to change the computer to test; 2. Re-plug or unplug or replace the USB port, and give priority to using the host rear interface or HUB with independent power supply; 3. Update or reinstall the driver, operate through the device manager or manually install the latest driver on the official website; 4. Check the system services and policy settings to ensure the operation of relevant services, and troubleshoot group policy restrictions; 5. Run the sfc /scannow command to scan the system files to repair system corruption problems. Most cases can be solved through the above steps. If the equipment is old, new equipment may be needed.
This error message usually occurs when you try to access a peripheral (such as a USB drive, printer, mouse, keyboard), and the system cannot recognize it normally or use it. The problem may be in the hardware itself, or it may be due to drivers, system settings, and even USB interface issues.
Here are some common solutions, in order of troubleshooting:
1. Check whether the equipment itself is normal
First confirm whether the equipment is physically damaged or poorly contacted. You can try the following steps:
- Change a computer to plug in and see if it works properly
- Check whether the power cord and data cord of the equipment are intact
- If it is a USB drive or a mobile hard drive, try to use the disk management tool to see if it is displayed but cannot be accessed
Sometimes the problem is not actually your computer, but the device itself is broken or the power supply is insufficient.
2. Re-plug or replace the USB port
This problem is sometimes just a temporary connection exception, changing to a USB interface may solve the problem:
- Try plugging the device into another USB interface, especially the interface behind the host is often more stable
- If you are using the USB port on the front panel, try plugging it directly into the port on the motherboard.
- Use a USB HUB with independent power supply to troubleshoot insufficient power supply
Some motherboards have USB interfaces that belong to different controllers. Changing the interface is equivalent to changing the controller, which may bypass the fault point.
3. Update or reinstall the device driver
This is one of the most common repair methods, because the driver is damaged or expired, which will cause the device to not be correctly identified and used even though it is connected to the system.
You can do this:
- Open Device Manager
- Find the corresponding device (maybe marked with a yellow exclamation mark)
- Right-click to select "Update Driver" or "Uninstall Device"
- Then re-plug and unplug the device and let the system automatically install the driver
If the drivers that come with the system are not working, you can download the latest version to install them manually on the official website of the device.
4. Check system services and policy settings
Sometimes, the system's services or group policies limit the normal use of the device, especially in enterprise environments.
You can try these operations:
- Press
Win Rto enterservices.mscto enter - Find the services related to " Human Interface Devices " or " USB Mass Storage Device "
- Make sure they are running, if not, right-click to start
In addition, you can also try to check whether there is a policy to disable external storage devices through the Group Policy Editor (for Windows Pro users).
5. Run the system file checking tool
System file corruption may also cause this type of problem. You can use built-in tools to scan it:
- Open a command prompt (administrator permissions)
- Enter
sfc /scannow - Wait for the scan to complete and restart the computer
This step may not be effective every time, but if you try other methods and haven't solved it, it's worth a try.
Basically these commonly used methods. In most cases, the problem can be solved through the previous items. If the old device has poor compatibility, you may have to consider replacing it.
The above is the detailed content of How to fix 'A device attached to the system is not functioning' error?. For more information, please follow other related articles on the PHP Chinese website!
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