Quote:
Originally Posted by Soundy
Bet there's a loose screw trapped under the motherboard, and when you turn it upright it settles somewhere that shorts a mobo trace to the chassis. In fact, I've seen exactly this happen before.
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+1 I have to agree.
You should tear your machine apart and recheck your build and make sure everything is where it should be. You will most likely find your problem when disassembling.