I would test for a bad RAM slot by powering on with one slot empty, and then the other. Removing and re-seating the upper part of the assembly from the main board (which you'll do in order to get to the RAM) also couldn't hurt, in case something is not connecting right.
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A PRAM reset never hurts either.
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A PRAM reset never hurts either, in case it's stuck in a funky resolution or some odd video mode.
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I'd also blow out the inside with compressed air while you're in there.
I would test for a bad RAM slot by powering on with one slot empty, and then the other. Removing and re-seating the upper part of the assembly from the main board (which you'll do in order to get to the RAM) also couldn't hurt, in case something is not connecting right.
A PRAM reset never hurts either.