1.83, 2, or 2.16 GHz Core Duo processor

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Why does my smc keep reseting itself?

fans turn to max at once, when I first start the macbook. after a while, 30- 60mins the macbook just shuts down. for no reason.

after smc reset, everything is fine again...

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The computer is protecting itself from damage. Probably from some component overheating. See if you can find a hot spot.

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Try the Apple Hardware Test, might turn something up.

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