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<blockquote data-quote="cxviking" data-source="post: 1858283" data-attributes="member: 405160">My 27” iMac, OS (late 2012), OS10.13.6 (High Sierra) has a troubling problem. The computer shuts down randomly for no apparent reason. Not related to doing something specific or memory intensive, sometimes just after an hour being on, sometimes after several hours or even days. Powers itself off with no sound, not even a click, just as if the plug was pulled. Tried redoing hard drive from backups, changing plug-ins, booting from external drive, all to no avail and the problem persists. The only thing that actually allows power on again after a shutdown is to unplug the computer for one minute, then plug it in again and restart.&nbsp; Ran a utility, smcFanControl 2.6, and it shows the fan rpm as 1254, temp hovering around 102 -104 degrees F. (Is that normal?)&nbsp; But it will shut down even at 5 am when the house is cool, so don’t think it is overheating. Checked all previous posts here about random shut downs - the only similar entry was in 2015 in which the guy stated it was fixed but didn’t respond on how it was fixed. Any ideas will be gratefully accepted and tested!</blockquote>

[QUOTE="cxviking, post: 1858283, member: 405160"] My 27” iMac, OS (late 2012), OS10.13.6 (High Sierra) has a troubling problem. The computer shuts down randomly for no apparent reason. Not related to doing something specific or memory intensive, sometimes just after an hour being on, sometimes after several hours or even days. Powers itself off with no sound, not even a click, just as if the plug was pulled. Tried redoing hard drive from backups, changing plug-ins, booting from external drive, all to no avail and the problem persists. The only thing that actually allows power on again after a shutdown is to unplug the computer for one minute, then plug it in again and restart. Ran a utility, smcFanControl 2.6, and it shows the fan rpm as 1254, temp hovering around 102 -104 degrees F. (Is that normal?) But it will shut down even at 5 am when the house is cool, so don’t think it is overheating. Checked all previous posts here about random shut downs - the only similar entry was in 2015 in which the guy stated it was fixed but didn’t respond on how it was fixed. Any ideas will be gratefully accepted and tested! [/QUOTE]

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