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Message: <blockquote data-quote="cxviking" data-source="post: 1858752" data-attributes="member: 405160">Status Update: First, thanks a million for all the suggestions and advice that was forthcoming when I stated my problem. Also, I have found the fan control utility to be a real boon and gives me a level of comfort when I can up the fan speed a bit as required. My tech opened and thoroughly cleaned out the internal compartment of my iMac. Since back in my house, it has been running for the equivalent of two days now with nary a shutdown, temps now showing in the low 80s and low 90s, so I am hopefully optimistic that it was just dirt and overheating that was causing the problem. Only more time will tell for sure!  Again, thanks all - this forum rocks!</blockquote>