Power Light on all the time...

Today while changing out my video card, I dropped the screw down inside the computer. Being unable to get at it, or find it, I took the computer to the Genius Bar. The fella there said 'I doubt it will cause any harm' and proceeds to just plug it in, before I could say to him 'wait, I'm concerened that if that screw is touching METAL under there, it can fry something, and that's why I brought it in, instead of just turning it on myself'.
So he plugs it in, and the power light comes up immediately. Hmm. Strange. I assure him, the computer was working fine as I shut it down to install the card.
So now the computer is dead (and I'm convinved he turned it on, that screw somewhere in there fried something). So I'm pretty upset, this guy seemed completely incompetent. I should have just disassembled it all myself I guess, but made me nervous.
So has anyone seen that, the power light just comes on when you plug it in, no fans turn on, no other lights on the motherboard come on.
So he's thinking either MLB or power supply, and I beg him to order both, since it could be either one. They won't because they can only order one part at a time, if it's not that, then they'll order the other part. I'm furious, this is ridiculous...
Genius my but.

The power supply is pretty much sealed, so I doubt any screw could get in there. Can you hear anything moving around in it when you pick it up and shake it? Try reseting your PMU.
-Bmer
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Power Light on all the time...

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