can it work with the bios?
if it can then it probably isn't the hardware.
Scan for malware or even rootkits as well.
it works with bios, but it works with windows for a few hours before it stops, and i don't spend hours sitting in the bios.
i've done all the malware scans i can think to try. what rootkit scanner would you recommend? i've used tdsskiller, but to my understanding it misses some things anyway.