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Randy B. Singer

 
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Member Since: Feb 01, 2011
Location: Sacramento, California
Posts: 566
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Randy B. Singer is offline
When a Mac desktop is spontaneously shutting down without an error message, the first thing that I suspect is a bad power supply.

When a Mac laptop is shutting down without an error message, the first thing that I suspect is a bad battery and/or energy-saving circuit.

You may want to download this program and see what it has to say about the health of your battery/energy-saving circuit:

coconutBattery (free, donations accepted)
coconutBattery 2.7 - by coconut-flavour.com

You may want to try re-calibrating your energy-saving circuitry:
Apple Portables: Calibrating your computer's battery for best performance

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Randy B. Singer
Co-author of The Macintosh Bible (4th, 5th, and 6th editions)

Macintosh OS X Routine Maintenance
OS X Maintenance And Troubleshooting
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