Win7 32-bit system usb interface does not respond Cause analysis and solution

1. USB service is disabled: If there is no problem before, then it may be when the user uses the system such as Jinshan Guardian or 360 Security Guard to optimize the system. If the USB service is disabled accidentally (the system plug-and-play service is disabled), the USB interface will be unavailable.
Solution: Check the Jinshan Guardian or 360 Security Guard's boot optimization service project, check if some key system services are disabled, find the boot, or use Jinshan Guardian to optimize the recommended items.

2. The USB interface on the front of some computer chassis is not available. When installing the machine, I forgot to connect the USB interface cable on the chassis to the motherboard. Therefore, the USB interface on the front of the chassis cannot be used. Try connecting. The USB interface on the back of the chassis, the rear USB interface is provided by the motherboard, generally solve the problem;
3, the USB interface is damaged or the motherboard is faulty: If the above situation has not solved the problem, then you need to pay attention to the USB interface. Failure or equipment failure, it is recommended that you can take a few more USB devices to try, if multiple devices, such as mobile phones, U disk, etc. can not be used, or other computers can be used, their own can not be used, then May be the USB interface is damaged, we can try to change the other USB interface behind the host to try, if it still does not work, then basically can be determined to be the motherboard problem, it is recommended to take over.

4, the USB function is disabled in the BIOS settings: By default, the USB control switch is enabled in the BIOS of the motherboard. If the BIOS or BIOS error is set incorrectly, the USB interface may be disabled, so if you eliminate the above problem , then it is recommended to check if the BIOS settings have disabled USB. Solution: When restarting the computer, press the DEL keyboard to enter the BIOS settings, then find the USB settings item to check.