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IMac randomly shuts down. Any ideas why?

November 30Hits:0
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2011 iMac just shuts down by itself. Ran the maintenance scripts, rest the SMC and have tried resetting PRAM. Anyone else have the same problem or better yet a solution?

Answers

Get some temprature readings:
Here is a link to a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/
http://www.intelmactemp.com/list

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