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thewk

 
Member Since: Feb 21, 2009
Posts: 14
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Are you sure that the motherboard you bought was correct type? Also when it was installed, did you make sure there are no short circuits, that it is in place perfrectly and no screws etc are touching the backside of the board? Does keyboard and/or mouse lights lit when you power up the machine? Can you get into open firmware by powering up the machine and immediately pressing CMD, ALT, O ja P keys together at the same time? If it does get you to open firmware then USB-ports are working but there is something wrong with OS X. Try doing PRAM-reset by pressing CMD, ALT, P and R -keys at the same time right after you have pressed power button, you should heat loud noise and probably see the sleep led flashing, after you hear the chime second time you can let it to boot normally.

I personally would have changed the cap/caps since motherboards tend to be expensive....
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