u disk can not enter win7 Ultimate system prompt hardware unrecognized solution

1, first press F2 to enter the BIOS command at boot time, then check the BIOS can identify all the hardware, then identify it, You need to reset the BIOS command once;

2. If you still can't enter the pe system, then try to press F8 to enter the safe mode, then select the last correct configuration test, or then enter the system. Possible cleanup optimization system and offline antivirus test boot.

3, if not, open the desktop chassis, check the CMOS button battery, replace with less than 2.5 volts, clear the CMOS settings, reset the BIOS command; clean all motherboard slots, Polish all hardware connectors, replace the new cable, and then re-tighten.