Q: Why does my Mac keep shutting itself down?
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Aug 13, 2015 7:46 AMby a brody,Heat. A bad battery. Bad capacitors. Damaged liquid cooling. Accidentally hitting the key combination to sleep or shut down.
Bad capacitors were a commonplace problem for all computers in the 2004 to 2006 time frame because of an industry sabotage that happened.
However with newer computers such issues were less commonplace.
Pre-Intel PowerMac G5 towers used liquid cooling on their fastest versions in 2005 to 2006.
Not knowing your Mac model we can't give you more information
http://discussions.apple.com/docs/DOC-6413
Note even non-notebooks have what is known as a CMOS battery, or PRAM battery. Notebooks frequently have both, or a capacitor that functions in place of the CMOS functions. Typically after the end of the third year the CMOS battery comes close to needing a replacement.
Heat is discussed in detail here:
kmb kmbp: How to deal with MacBook Pro and MacBook heat?
Keyboard shortcuts built-in are here, and sometimes can be overridden if you use built-in speech recognition with other shortcuts:
