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Helpful answers
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Jun 22, 2016 4:47 PM in response to MissionCompleteby MissionComplete,Wanted to follow up on this.
I first brought my iMac (27-inch, Late 2012) 3.4 GHz Intel Core i7 NVIDIA GeForce GTX 680MX 2048 MB 1 TB Fusion into Apple for repair last month, they kept it for a week and said it was the SSD failing which is part of my fusion drive, and charged me $500 plus to fix it. Pricey, but problem solved, right? No.
I got it back, problem persisted. I took it back in.
Very thankful that on my second visit I got a knowledgeable and helpful genius who knew right away that the SSD was a misdiagnosis of the problem. He refunded my $500 and told me that he was almost certain it was a power supply issue. He also repaired that for free since they wasted my time the first go around.
I've had the computer back for about a week and so far so good (though, only time will tell). This is what I've concluded:
This is a HARDWARE issue. I refuse to believe that we are all using some special combination of software that could be causing this issue when we all have the exact same model of iMac.
My advice is take your computer into Apple, show them this thread and that it isn't an isolated issue. Have them repair your power supply first, which is the cheapest of the repairs I've seen (around $150 at my Apple store).
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Jun 22, 2016 10:43 PM in response to Leutrim Sby NickFromLE,I assume the log entries are just showing where the problem occurs and not why the problem happens. In my case its a software issue but I have the exact same problem of what you describe. Just when I stop using Safari I dont have it anymore. It seems to work just for me but you can see the variety of the problems is huge and in the end its always that random shutdown problem.
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Jun 24, 2016 2:23 AM in response to Lagoiskiby FranFox,Another one here!
iMac (27-inch, Late 2012)
3,2 GHz Intel Core i5
NVIDIA GeForce GTX 680MX 2048 MB
After reading the 21 pages of this post I've no solution yet
I hope anyone can find a solution. I think I'll try to change the power supply by a non-original replacement.
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Jun 24, 2016 9:33 AM in response to FranFoxby NickFromLE,All I can tell you is what helped me and solved it until today.
I uninstalled Anti Virus Software and Steam. In my case it was Safari which was the problem. When I switched to Firefox I had no problem at all.
On my side it was a Software issue but it seems there are lots of causes for this behavior.
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Jun 26, 2016 1:27 AM in response to Lagoiskiby FranFox,Hi there! Just a little update that works by the moment for me.
My shutdown problems started on June, I live in Barcelona so in June is very hot indeed. My office is on a attic where is so warm. I suspected that the shutdown problems where from that but I've installed Mac Fans Control and I thought that will solve my problem.
After few days trying some methods (installing a clean SO in another partition, replacing RAM modules and so on) I moved my computer to the bottom flat in my office. The temperature was fall (in the near processor sensor) from 51/58º to 42/44º... Since 2 days here with the iMac running a lot of applications the problem seems to be solved.
I hope it helps someone.
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Jul 8, 2016 9:49 AM in response to Lagoiskiby Lnkn52,Just an update. After being promised that Apple was going to replace the iMac, three weeks later, still have not received the product.
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Jul 8, 2016 10:30 AM in response to Lnkn52by NickFromLE,Just an update from me - after updating the OS its getting better. My Safari Bookmarks are not mixed anymore, this is solved. But from time to time I still have that shutdowns... I will wait until sierra is out (no beta) and hope that will solve it once and for all...
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Jul 14, 2016 9:21 AM in response to CharlesYby CharlesY,Oddly, I've noticed that occasionally (perhaps one in every 10 or so events), I am able to press the power button and the machine will wake from hibernate. I'll get the series of dark grey rectangles across the screen that sequentially lighten and the machine will restore to its previous state.
Why (or how) an iMac is going into hibernation, I have no idea. I always count it as a win if I can recover from a hibernate. unfortunately it does mean I'll be due another event somewhat soon.
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Jul 15, 2016 11:14 AM in response to CharlesYby UKscottyGB,Hi guys,
well I'm back & the problem has resurfaced after 5months since the following parts were replaced: logic board, power supply and power cable.
Spoke to Apple about it & they have suggested I take it back in (again) to get it checked. I can't believe this is still happening after all this time. It's 9months now since the shutdowns first started & I don't believe it will ever get sorted
I've been an Apple customer for 25yrs and I'm feeling a bit let down :-(
I'll keep you posted.
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Jul 15, 2016 11:22 AM in response to Lagoiskiby daskyzdalimit,Hey everyone,
My iMac 27" never got fixed. The problems persisted even after replacing the logic board, memory, power supply, graphics card, etc.
Apple decided to replace it with a brand new 5K iMac. I think you guys should continue to talk to Apple and keep the conversation going. Obviously, don't be an *** to the person you're working with. Apple continues to have one of the best customer service so be respectful, courteous, but at the same time, address your concerns and explore all possibilities to solve it.
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Jul 17, 2016 4:59 AM in response to Lagoiskiby Bianchiboy,Another one to add to the list, Late 2012 27" i7 iMac. So far I've had the 3Tb fusion HD replaced, logic board replaced, power supply replaced, airport card replaced, RAM replaced.
And the random shutdowns continue, 4 already before lunch today needing an SMC reset.
It's going to the Apple store yet again on Friday, let's see what parts they throw at it this time. They claim the problem has never happened when the machine has been in their hands but I've shown them video of it happening and kept console logs.
I'm actually quite surprised it's stayed on long enough to type this.
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Jul 19, 2016 1:24 AM in response to FranFoxby Solidairs,Hi - I am inclined to agree with you. Having not had the problem for about 2 years of constant use the machine shut down yesterday which was the hottest day in our locality for quite a long time. Not a solution but it could indicate a cause.
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Jul 21, 2016 8:46 PM in response to Lagoiskiby mattwithcats,Looks like all the problems are being caused by processors with 77 watt TDP (Thermal Design Power)
I suggest that the 3.2 Ghz i5 folks ask for an upgrade to the i7 3770S processor,
which is 65 watts.
The i7 3.4 Ghz folks can put a 3770S in, but it's a 3.1 Ghz processor.
A small fan may help, I use a USB fan when doing processor heavy tasks
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Jul 22, 2016 3:40 AM in response to Lagoiskiby FranFox,Hello guys, for those who think that is a temperature problem. I've find a very good software to monitor and log the temperature of all your sensors. https://www.tunabellysoftware.com/tgupdate/
(You need to purchase the Mac Store version to run with all the features - Cost 12€)
Maybe we can share the temperature data when a shutdown occurs.
Today was a very hot day in Barcelona, 3 shutdowns in less than an hour. I've reduced the temperature of the room and no more shutdowns by the moment.
I'll keep you updated. Good luck!
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Jul 22, 2016 4:00 AM in response to FranFoxby Solidairs,Good plan ......will do the same and post results.