what to do?
Try restarting by holding down the Shift key to boot into Safe mode.
Mac OS X: Starting up in Safe Mode
Mac OS X: What is Safe Boot, Safe Mode?
Does it give any signs of life?
no nothing not a peep
Fried power supply? Have you checked that it is actually getting power? (Our plugs have fuses, which often blow on occasions like that). Otherwise I think a trip to the repair man ...
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