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How To Fix A Randomly Rebooting Mac (OS X 10.8 – Mountain Lion)

My iMac was rock stable, right up until I installed Mountain Lion on it.  Then, at random times, it would suddenly reboot.  Fortunately, most of it seemed to happen at night – I’d get up in the morning and find my Mac had rebooted. Weird. So, I finally got around to investigating the problem – …

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