U disk caused the computer inexplicable crash solution

1, if the USB is not recognized by the computer, due to system drive problems caused by the crash, we can repair by the following method:

boot press F8 to enter safe mode After exiting, choose to restart or shut down at boot, you can enter the normal mode (fix the registry), if the fault persists, please use the system restore that comes with the system, restore to the time you did not have this fault repair (if normal Mode recovery failed, please press F8 to enter safe mode and use system restore). Use system disk repair, open a command prompt and enter SFC /SCANNOW Enter (there is a space between SFC and /), insert the original system disk repair system, the system will automatically compare the repair. And set the CD-ROM drive in the BIOS to insert the system boot disk into the first boot device, press R to select “ repair installation & rdquo;

2, if the U disk is inserted into the computer, the computer prompts "Unrecognized device", the failure caused by the failure, the diagnosis method is as follows:

If the U disk is inserted into the computer, the computer prompts "ld"; The unrecognized device indicates that the power supply circuit of the USB flash drive is normal. Then check the USB interface circuit failure of the USB flash drive. If the USB interface of the USB flash drive is normal, the clock circuit may be faulty (the clock frequency of the USB flash drive and the computer cannot be synchronized). The crystal and resonant capacitors in the clock circuit are then detected. If the clock circuit is normal, the master chip is not working properly. Detect the power supply of the main control chip. If the power supply is normal, the main control chip is damaged and replaced.

3, sometimes due to lack of USB power supply computer crash, the solution is as follows:

Use a powered USBHUB or use a USB to PS/2 adapter. It is also possible that Windows XP has enabled the power saving mode by default, which causes the USB interface to be insufficiently powered, causing the USB interface to intermittently fail. Right-click on My Computer/Properties/Hardware/Device Manager and double-click “Universal Serial Bus Controller” to go to “USB Root Hub”. Double-click any one to open the Properties dialog and switch to “Power Management”. & rdquo; tab, remove the "Allow the computer to turn off this device to save power" check, click OK to return, in turn modify the properties of each USB RootHub and restart the computer. The USB device can resume stable operation, and the frequency should be set as low as possible.