The Reverend should have fixed this problem by resetting the CMOS, however certain PC's have a feature to auto turn on the pc.Check your BIOS again for anything like this and turn it off.Mine has this feature and it drove me crazy untill I figured out why my system kept turning on in the middle of the night.Just a thought..Does this problem occur if you force the system to shut down?By holding the power button for several seconds...