There could be a memory bar problem. Software failure, driver mismatch. At this point, make sure the circuit is energized. Just list the memory bar this fault, the motherboard components damaged, pull out to wipe the gold finger parts, try again, the motherboard indicator light is not bright. Software hardware failure, we must first look at the power supply, CPU fan has no rotation: system crashes, hard disk damage, will cause the computer can not start, Trojan horse virus. There may be other common faults hardware, there are: memory corruption