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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 NickFromLE,

    NickFromLE NickFromLE Sep 6, 2016 10:48 PM in response to lune-cheung
    Level 1 (22 points)
    Desktops
    Sep 6, 2016 10:48 PM in response to lune-cheung

    Hi Lune,

     

    I had 3 choices...

     

    the SSD Slot Add in Kit from OWC

    https://eshop.macsales.com/item/OWC/SSDIM12Y960/


    or what I did:

    SATA Blade SSD Module - Dual SSD Drive Kit for iMac 27 Inch 2012 Model

    http://www.ebay.de/itm/SATA-Blade-SSD-Module-Dual-SSD-Drive-Kit-for-iMac-27-Inch -2012-Model-/291716561481?hash=item43eba…

    plus an mSata or m2.Sata 1TB HDD which i connected there. Its very small and fit in every case of an iMac...


    And you can also ebay for existing original Blades by Apple (it should come from an iMac 2012):

    http://www.ebay.de/itm/orginal-Apple-Samsung-128GB-Blade-SSD-Macbook-Pro-Retina- 2012-2013-iMAC-27-2012-/131930657447?hash=item1eb7ae12a7


    I took the cheaper way and paid about 270$, the OWC Kit is about 445$ but includes screwdriver and screw to fix the blade...

    I had a screw by myself and the screwdrivers as well. You need a Torx T10 and T25. Just watch the video by OWC, its great:

    https://player.vimeo.com/video/139364065?autoplay=1&title=0&byline=0&portrait=0


    Its just up to you what you wanna spend.


    Cheers,

    Nick

  • by Glasgood,

    Glasgood Glasgood Sep 7, 2016 1:38 AM in response to NickFromLE
    Level 1 (4 points)
    Sep 7, 2016 1:38 AM in response to NickFromLE

    Thanks for the update Nick,

     

    I can confirm that the PSU that is replaced was also the Delta (Model: ADP-300AF T).

     

    All going well with my iMac since replacing the PSU.

     

    Best

  • by NickFromLE,

    NickFromLE NickFromLE Sep 7, 2016 2:24 AM in response to Glasgood
    Level 1 (22 points)
    Desktops
    Sep 7, 2016 2:24 AM in response to Glasgood

    Thank you too for your update.

    Which PSU you are running now? A new Delta or the liteon?

     

    Cheers,

    Nick

  • by lune-cheung,

    lune-cheung lune-cheung Sep 7, 2016 5:52 PM in response to NickFromLE
    Level 1 (4 points)
    Sep 7, 2016 5:52 PM in response to NickFromLE

    Thanks for the great information. 

    I have 128G fusion drive already as a fusion, look like the people using dual connections to boost the speed up to 900Mbs. I may consider that in the future.

     

    I just bought the Samsung 850 Evo 1Tb SSD. I am planning to install this SSD when I swap out the PSU.

     

    Also, The PSU I have bought is a Liteon, and I am still waiting for its arrival.

    The reason I bought the Liteon, because most of the iMac PSU are found as Delta. I suspect Delta has more issues than Delta, I just give it a try.

     

    I will do some stress test once I installed the Liteon PSU. see how does it go?

     

     

    Regards,

     

    Lune

  • by oomoot,

    oomoot oomoot Sep 8, 2016 1:35 AM in response to Glasgood
    Level 1 (4 points)
    Desktops
    Sep 8, 2016 1:35 AM in response to Glasgood

    I have a similar machine. Late 2012 i7 3.4GHz 32GB 680MX. I got my power supply replaced by Apple Store itself in Istanbul around 10 days ago. I never tried to replicate the shutdown problem in safe mode but I even got the shutdowns on the windows 10 partition and another partition that I created for testing purposes.

    Apple Store itself of course couldn't replicate the problem like almost everyone else in here experienced. It's probably down to power supply not being powered on for far too long). But they still replaced the power supply for around 115 US Dollar (340 Turkish Liras)

     

    By the way as far as I'm told it's a 300Watt part. While I was at it I asked them to fit the machine with some other type of power supply made for other,  possibly newer iMacs that utilize a higher wattage part. They refused to do so. Apple policies obviously. I haven't asked about the brands of the outgoing and incoming power supplies. I'd do so if I had read the related posts in here.

     

    Long story short, for the past ten days the machine has always been on, I had played Civ V for like 10 hours at once, max. settings and so far no shutdowns. So, tho Apple Geniuses failed to replicate the problem and tho it seems like a problem Apple itself should acknowledge and pay for, apparently the replacement of the PSU resolved the issue.

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