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

Hi, these days I'm having the same problem.

My iMac (late 2012 i7, 32gb ram, fusion drive 1TB) shuts down randomly with no apparent reason.

I looked some threads on the apple support community with no help.

The computer shuts down in idle and in full load situations.

Even when I'm using windows 8 with a boot camp partition.

I called the Apple support and they told me to do a full hardware test ( hold D on startup ).

It took a while (about 3 hours) but it was clean.

The guy who I talked with told me to do a clan install of the system in case the hardware test was clean. Maybe it is a software problem ( oh yes he checked the caches and .plist file too)

If it persists after a clean install I should take by mac to assistance to be checked and repaired if needed.

I'll contact the support again on Monday GTM+1 time because I had a shut down even using windows...

I guess (unfortunately) it's some hardware problem....

Hi, same problem.

My 27 iMac i5 2012 shuts down randomly, for restart unplug power line for 30 seconds, (reset SMC).

After hardware test (ok) reset imac with clean install but never same problem.

how your have resolved.

think apple support say.

THANKS

Hi, in the end I brought the computer to the Apple Store and they changed the power supply.

It wasn't a software problem.

It was on apple care so I did't pay, but i was around 70€ I think.

Got the same problem as well - similar spec machine etc. My suspicion too is that it is a hardware fault - guess will have to take it back to Apple (out of warranty now though). Wonder if there are a bad batch of power supplies out there?

Hi Guys

I've has exactly the same issue, sometimes up to 10 crashes in a day. Has anybody had a definite resolution on  this issue? Thanks.

So has anyone figured out the issue of this problem yet? This happened to my late 2012 iMac 27 inch. about three months ago. Took it to the Apple store and they told me it might be a hardware issue and had to replace the whole logic board, which will cost me $700!!

@iForce_ did you resolve this issue by simply changing the power supply?

I have the same issue. Is someone has a solution? Do Apple read and help to solve the problems on their forum?

Hey guys,

hate to say it, but nothing you will do will fix this problem.

I have had it for more than a year, along with corrupting graphics. Random crashes. Try this. . . .When it happens next, when you first turn your computer on, try a PRAM Reset when it boots for the first time after the crash. I bet it crashes for you again before it can complete the PRAM reset.

I have had my logic board replaced twice and my power supply once. Now the most recent fix, (logic board and power supply) has failed too and it's now crashing again after a month and half of being stable since the repair.

I just called Apple and they are replacing with a current model imac with same upgrades, honouring the upgraded processor and video card I had in there.n

The tech said on the phone that my call was pretty much going to make this become a "known issue". Get your replacement and don't put up with a buggy build.

Experiencing exactly same issue here... iMac 27 (late 2012) with 3.4Ghz i7, 16gb ram.

Random power fail requires SMC reset. I got power supply replaced by Apple Store but it starts again!

I wonder if this is fundamental design defect. I don't have Applecare so I had to pay around $100 for power supply. Now I don't know what I should do. I don't want to pay for logic board... Now I am trying to order new RAM.

Please let us know if you have found any solution for this situation.

Thank you!

Similar problem here with my iMac 27 (late 2012) .  Bought and using Temperature Gauge Pro to control the fans (still shutsdown at times).

This model is a bad apple.

I spent over $2,500 for this computer and expected at least 4 years of untroubled usage.

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