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it stops at turn on

the screen is always black and the fans go very quickly

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This is the "panic mode". The computer doesn't know what to do and revs up the fans as a safety measure. Usually, with these line of Macs it boils down to a faulty graphic chip and/or bad caps on the logicboard. Please read the other posts related to this problem.

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+ do a search for "capacitor"

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