Lagoiski

Q: 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

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

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  • by vanstar sydney,

    vanstar sydney vanstar sydney Mar 6, 2015 2:20 PM in response to vanstar sydney
    Level 1 (1 points)
    Mar 6, 2015 2:20 PM in response to vanstar sydney

    Just a heads up, Seems that the TechTool Pro app can offer some pertinent info on our macs. I have not tried it yet. 99USD.

    Here's an email reply just received, where I asked about various possible tests.

    'Hello,

     

    Thanks for your email. The new sensors test in TechTool Pro 8 includes tests of a variety of your Mac’s internal sensors, including those related to your power supply. If the electrical output coming across the sensor for your power supply is outside of the acceptable range for that particular sensor, it will trigger a failure in that test.

     

     

    Thanks,

     

    Micromat Help'

  • by Fametown,

    Fametown Fametown Mar 7, 2015 4:21 AM in response to Lagoiski
    Level 1 (4 points)
    Mar 7, 2015 4:21 AM in response to Lagoiski

    I just used TechTools 8 and all the tests are OK. Yesterday my iMac shutdown more than 10 times during the day. Brrrrr.

  • by Fametown,

    Fametown Fametown Mar 10, 2015 3:08 PM in response to Lagoiski
    Level 1 (4 points)
    Mar 10, 2015 3:08 PM in response to Lagoiski

    I just made this video. I use iStats Menus 5 for the sensors.

     

    https://www.youtube.com/watch?v=fal-OzSzF6Y&vq=hd1080

     

    All it's ok just before the shutdown ???

  • by sfgswedfstfsd,

    sfgswedfstfsd sfgswedfstfsd May 6, 2015 7:59 PM in response to Lagoiski
    Level 1 (0 points)
    Desktops
    May 6, 2015 7:59 PM in response to Lagoiski

    It's been a year now... I have the same model as most of the people here... Apple please help to fix this issue!!!

    This machine is the single most expensive item I've bought straight out of my pocket and it only lasts for 2 years?! This issue is obviously Apple's fault and why are we paying to fix something that you guys caused?

  • by vanstar sydney,

    vanstar sydney vanstar sydney May 6, 2015 9:40 PM in response to sfgswedfstfsd
    Level 1 (1 points)
    May 6, 2015 9:40 PM in response to sfgswedfstfsd

    I hear you .. It is time for Apple Inc. to own up and rectify the random shutdowns affecting so many - iMac Late 2012 27".

    sfgswedfstfsd, I have found that shutting down the imac at night (before bed) and removing the power cord from socket, sometimes allows a full days usage without shutdowns. When inserting the power cord to restart, make sure the power is switched off, insert into imac, switch on, then wait 5 seconds before pressing the computers rear power on button. Run disk repair permissions utility often as well - not sure if this helps, but no harm in doing so.

    Also, if upgrading to 10.10.3 use the Combo updater.

    GOOD LUCK

  • by sfgswedfstfsd,

    sfgswedfstfsd sfgswedfstfsd May 6, 2015 10:00 PM in response to vanstar sydney
    Level 1 (0 points)
    Desktops
    May 6, 2015 10:00 PM in response to vanstar sydney

    Yes! I've also found that the longer you leave the iMac unplugged, the longer the iMac will stand before the random shutdown. However, the iMac would need to be left alone plugged for a couple of days. I've tried this before and it'll stand for a week or so with no problem.

    I swear this $3,000+ machine is designed for anger management... Been using my Macbook Air for almost a year because I'm so tired of it. This couldn't be called a computer if it doesn't even freaking work properly!!! Sigh.. sorry for all the anger.. Been keeping it for a while now.

  • by Andrew_Debbie,

    Andrew_Debbie Andrew_Debbie May 17, 2015 7:33 AM in response to Lagoiski
    Level 1 (4 points)
    May 17, 2015 7:33 AM in response to Lagoiski

    Our iMac 27 (late 2012)  is doing exactly the same thing.      Random crashes requiring SMC reset.    Resting NVRAM crashes the computer every time.

     

    Taking it in to Apple for repair soon.    Fingers crossed they will fix it  or replace it.

  • by vanstar sydney,

    vanstar sydney vanstar sydney May 17, 2015 2:31 PM in response to Andrew_Debbie
    Level 1 (1 points)
    May 17, 2015 2:31 PM in response to Andrew_Debbie

    Please post the results from Apple repair. There are a fair few here with the same computer and similar problems.

    I cannot let mine go, as I need it for work daily. Either a free repair or a new computer would be the proper result I reckon. Good Luck!

  • by smithy_dave,

    smithy_dave smithy_dave May 25, 2015 3:52 AM in response to Lagoiski
    Level 1 (0 points)
    May 25, 2015 3:52 AM in response to Lagoiski

    Hi All, I've also got the same problem. Crash can happen anytime without warning - incredibly annoying. Like mentioned about the restart requires the SMC to be reset. It's really upsetting that I've spent nearly £2,000 on a machine to try and get my freelance off the ground only for all these problems to occur. I can't help but think it's a software compatibility issue with the GPU rather then a hardware fault, as diagnosis tests come back clean and the crashes are so random. Plus the

     

    SPEC:


    iMac (27-inch, Late 2012), 3.4 GHz Intel Core i7, 8 GB 1600 MHz DDR3, NVIDIA GeForce GTX 680MX 2048 MB


    I've tried all the following things so far with no real luck as yet...

     

    1. Reinstalled OS.

    2. Formatted Everything and started over.

    3. Installed Cuda driver to cover the GPU errors people are talking about.

    4. Installed Java to cover even more errors.

    5. Ran Apple diagnostics test - came back clean.

     

    I use Dreamweaver and Illustrator and I've been reading that there are a lot of problems with the GPU and adobe's creative cloud...

  • by Andrew_Debbie,

    Andrew_Debbie Andrew_Debbie May 26, 2015 12:33 AM in response to vanstar sydney
    Level 1 (4 points)
    May 26, 2015 12:33 AM in response to vanstar sydney

    Our Genius bar appointment is tomorrow (27 May).   

  • by Andrew_Debbie,

    Andrew_Debbie Andrew_Debbie May 26, 2015 12:35 AM in response to smithy_dave
    Level 1 (4 points)
    May 26, 2015 12:35 AM in response to smithy_dave

    >>>I've tried all the following things so far with no real luck as yet...

     

    Have you tried resetting the NVRAM?   Does that cause your computer to crash?  

  • by Frederick Karayan,

    Frederick Karayan Frederick Karayan May 26, 2015 2:18 PM in response to Lagoiski
    Level 1 (5 points)
    May 26, 2015 2:18 PM in response to Lagoiski

    I am having the same issue for almost one month now. I opened a case with AppleCare and it has been escalated to AppleCare Engineering. This issue is perplexing because it behaves like a software problem and a hardware problem. Having to reset the SMC obviously points to hardware but it did not act up in a clean partition, which would point to software.

     

    Interestingly, the 27-inch Late 2012 never had an SMC/EFI firmware update but the 21.5-inch Late 2012 did. This may have nothing to do with the issue but I find it very unusual as Apple typically updates firmware on a system at least once within the first year or so from its original release.

  • by sfgswedfstfsd,

    sfgswedfstfsd sfgswedfstfsd May 26, 2015 2:33 PM in response to Frederick Karayan
    Level 1 (0 points)
    Desktops
    May 26, 2015 2:33 PM in response to Frederick Karayan

    Please keep us updated on the escalated AppleCare case! Apple must give free repair for this issue.

  • by smithy_dave,

    smithy_dave smithy_dave May 26, 2015 3:08 PM in response to Andrew_Debbie
    Level 1 (0 points)
    May 26, 2015 3:08 PM in response to Andrew_Debbie

    Hi, thanks for the suggestion, yeah I've tried the NVRAM but sadly no improvement. however since installing CUDA as mentioned in my previous post things have been a little more stable.

     

    - I'm going to add the NVRAM to my list, as forgot it when originally posting.

     

    Thanks, Dave

  • by smithy_dave,

    smithy_dave smithy_dave May 26, 2015 3:29 PM in response to Lagoiski
    Level 1 (0 points)
    May 26, 2015 3:29 PM in response to Lagoiski

    Hi All, Just a little update for you all...

     

    Since installing CUDA as mentioned in my previous post things have actually been a little more stable (should have probably given it more time) - I'm on my 3rd day without a crash - http://www.nvidia.com/object/mac-driver-archive.html - if this works, it would point to a GPU issue. I know GPU support is an issue currently with Adobe CC apps - but in all honesty I'm really clutching at straws and still have other issues listed below...

     

    The only things I would add, to my crash issues are:

     

    1. Wake up - from a sleep, takes much much longer, on a similar model (lower spec) at my place of work wake up is instant where as on my mac it takes sometimes minutes.

     

    2. And that this ALL (including the crashes) has only become an issue since upgrading the OS to Yosemite.

     

    Has anybody else experienced these alongside the random crashes?

     

    Thanks, Dave

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