My computer (AMD 64 bit 3500+) keeps turning itself off randomly. I've narrowed the issue down somewhat but need help to get any further... The only time it doesn't turn itself off is when it's sitting in the BIOS (Award). BIOS shows CPU temp is about 54 deg celcius, and all fans are working. I've blown out all dust and tried swapping ram sticks to no avail. 12 volt supply is sitting on about 11.8 V, not sure if this is an issue? Also when it turns itself off, the keyboard lights stay on (Numlock, etc), but all fans and drives turn off.