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Level 1

51 points

27 iMac (2012) crashes and requires smc reset to turn on

My late 2012 iMac, i7 16gig RAM 27 inches keeps shutting down. It looks like as if it was unplugged. Happens randomly. Sometimes while playing Diablo 3, surfing facebook or using iphotos or other apps. Seems to not crash if just left on overnight and not been used.

In order to turn it on again I have to unplug it from the power line for like 30 seconds, only then it starts.

I have the settings set to restart on power failure, but it does not.

Happened a few times a few months back. I have installed a surge protector and it worked fine for like a month or two. However last 2 days it has shut down like 10 times...

Help would be greatly appreciated. I suspect hardware failure.

iMac (27-inch, Late 2012), iOS 7.1.1

Posted on May 5, 2014 9:44 PM

574 replies

dlmorley

Level 1

4 points

Nov 14, 2017 5:56 AM in response to neff2k

Mine has been running faultlessly since fitting a LiteOn power supply's I am pretty sure you will solve the issue with one.

tyemoe9

Level 1

11 points

Nov 16, 2017 3:44 PM in response to Tambikerhiker

I have this same problem with my late 2012 iMac 27”. Took it to apple in SoCal and got power supply unit and logic board replaced. Now three months of no problems so far.

MindSpa

Level 1

4 points

Nov 20, 2017 3:16 PM in response to MindSpa

Apple store managers can do this at their discretion.

jvah1980

Level 1

8 points

Dec 18, 2017 7:25 PM in response to jvah1980

Unfortunately, the system ran solid for about two weeks and again has suddenly powered off without being able to reboot.

It will be back to Apple for the power supply.

I’ll keep you posted.

27 iMac (2012) crashes and requires smc reset to turn on