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Why does my Mac shut down unexpectedly and refuse to restart?

Unexpected Shutdown

If your Mac shuts down unexpectedly and refuses to restart, two possibilities are a bad logic board battery, or corrupted PRAM. Since the PRAM problem is easiest to fix, try restarting while holding down the Control-Option-P-R keys.

If that doesn't fix the problem, you should have your logic board battery tested.

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