Answer to: Does not power up, sleep light only blink once.Tool it the Geniusbar and agreed to the $300 depot repair for new logic board. When I went to pick it up i was informed that the problem was covered by warranty after all and the entire service was free! Happy with the way it turned out but am a bit upset they didn't tell me it was covered. I spent a lot of time stressing about whether or not to repair it.
Answer to: Does not power up, sleep light only blink once.Stefan, did you fix your problem? I have the same issue... this works for me. Connect power source. Hold command, option, shift, r, p, and power for 10 seconds. Release all at the same time. Immediately after release, power source light turns green; press and release power. Fans come on, and stay on. Machine starts 20-50 minutes later. I will travel to the U.S. soon and will have it serviced there. I hope this helps.