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Answer to: Won't boot - replaced power supply - now what?If there are no LED's illuminated and you've replaced the power supply, either DC in or logic board I would imagine. If you have trickle power to the board, LED #1 will illuminate.
Answer to: Diagnose Display or Video problem?There is a Quality Program with regards to this model year. However, a test has to be completed by a technician in order to validate the machine. There are two different cards for this model. Only the one card is affected. Did you try external video to see if its in fact the card?