I saw a similar restarting without reason problem with a computer at work. After reinstalling OS and replacing power supply to no avail, I once noticed an audible "click", coming from the nearby metal framed windows and blinds, right as the comp shut down...STATIC ELECTRICITY! It hit me like a ton of bricks that this might be the cause and after moving the comp a few feet from the windows, the problem dissappeared. I had never before heard the noise but I am certain that it need not be a powerful enough release to be heard from 20 feet away (where I was sitting at the time) to affect the delicate balance of a computer. I am also surprised that more damage wasn't done. Never underestimate outside forces!
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Sigma Zeta 314
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