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Helpful answers
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Oct 1, 2013 1:00 PM in response to momapimpingby BDAqua,Hello,
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
Open console in Applications>Utilities, check the system log for the date/time of the last problem & the Startup right after that for clues.
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Oct 1, 2013 3:11 PM in response to momapimpingby Allan Jones,Are you asking about the iMac Mid 2011 in your profile or another Mac model?