OS unresponsive, after hard restart, system chime, screen black
After the OS (Mountain Lion) been a bit dodgy for some time, it went unresponsive and I had to make a hard shut down. When restart again, the system chime comes, the screen lits up, but black and nothing more happens...
I've had issues with the fans going on very high rpm quiet often some months back.
Is it the logic board which has gone melt down?
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