While off, the computer mysteriously turns on (usually in the middle of the night). The computer starts to boot for 2-6 seconds and then turn off. Sometimes it will do this 2-3 times, sometimes it will keep doing this on-off thing for a week!
What I know:
1) Its not a virus. The computer has done this through complete antivirus cleaning, windows reinstallation, and installation of a completely new hard drive.
2) It is not a switch. The switch has been replaced.
3) It is not overheating. The problem will start even when the computer is off and has been off for many many hours.
4) Its not a ghost. We've already had an exorcism on this thing (<---just kidding )
Our solution so far:
When this problem jumps up, we just turn off the power supply and let the computer rest for a few days and try again. If it is still happening, again, let it rest for a few days. Usually by a week it has stopped and the computer functions perfectly for months and months. Of course, it always comes back