My mates PC does the same, when the PC shuts down, for no reason what so ever the PC re-boots itself, we too have looked on Google for solutions to this eratic behaviour but found nothing, so we...

Found an even easier solution, my mates PC did the same, so we put his HDD into the one we had at work as we were going to transfer some files he wanted to keep, then format his HDD, but in the...