Mid 2011 27" iMac keeps kernel panicking

Discussion in 'iMac' started by rctneil, Mar 16, 2017.

  1. rctneil macrumors member

    Joined:
    Jul 29, 2013
    #1
    Hey,

    Yesterday evening my Mid 2011 27" iMac keeps kernel panicking. I'm working away and suddenly the display flashes, goes white and shuts itself off. Some of the time I can just turn it back on again and it boots fine, others I turn it back on and I see the Apple logo, the progress bar and after that a just off white screen that stays there.

    If the boot is successful it will then kernel panic again after a random amount of time. I've not been able to determine what is actually causing it.

    I've spoken to Apple Support and done PRAM and SMC reset but no luck.

    All drives have been verified and repaired, no problems there.

    Any ideas as to how I could proceed from here?

    Thanks,
    Neil
     
  2. keysofanxiety macrumors 604

    keysofanxiety

    Joined:
    Nov 23, 2011
    #2
    Sounds like graphics failure. The Radeons in the 2011 iMacs/MacBooks are pretty notorious for that. :(

    You can try to download gfxCardStatus and force the OS to use the iGPU at all times. If it doesn't kernel panic when doing that, this would almost certainly confirm this: http://gfx.io/downloads/gfxCardStatus-2.3.zip

    Just a heads up that the above application sometimes doesn't work and it'll switch to dGPU anyway. But it's worth a try.

    You can also verify that all the RAM fitted in your machine is 1333MHz. And quickly check HDD SMART, why not: https://cloudfront.volitans-software.com/smartutility323.zip
     
  3. rctneil thread starter macrumors member

    Joined:
    Jul 29, 2013
    #3
    ^ Thanks. Once i've finished work i'll get back to the iMac and give both of those things a go. I'll report back!

    Thanks again,
    Neil
     
  4. rctneil thread starter macrumors member

    Joined:
    Jul 29, 2013
    #4
    I can't even get the machine to stay on long enough to try those. I have an appointment at an Apple store tomorrow so i'll report back after that.
     
  5. archer75 macrumors 65816

    Joined:
    Jan 26, 2005
    Location:
    Oregon
    #5
    Video card. Mine died too and I just sent the card out for repair today.
     
  6. rctneil thread starter macrumors member

    Joined:
    Jul 29, 2013
    #6
    When you say that? Who is repairing it and how much did you pay?
     
  7. archer75 macrumors 65816

    Joined:
    Jan 26, 2005
    Location:
    Oregon
    #7
    $155 to replace the GPU. Brickfence on ebay. He has 100% feedback.
     
  8. rctneil thread starter macrumors member

    Joined:
    Jul 29, 2013
    #8
    Took it to the Apple Store yesterday. It passed all Video and GPU tests but failed on Logic board ones. Quoted £484 to repair. Gonna skip the repair and get a new machine.

    Anyone want to buy a 2011 27" iMac for parts?
     
  9. archer75 macrumors 65816

    Joined:
    Jan 26, 2005
    Location:
    Oregon
    #9
    So I did the repair I mentioned above. Bought the GPU chip replacement on ebay, removed the video card from my imac and sent it in. He sent my card back a week later with a new GPU on it. Installed it and my imac is working again! So far so good!
     
  10. ahostmadsen macrumors 6502a

    Joined:
    Dec 28, 2009
    #10
    $155 for the labor, but not including the GPU? What is the price of the GPU? I also have a 2011 iMac with a dead video card.
     
  11. archer75 macrumors 65816

    Joined:
    Jan 26, 2005
    Location:
    Oregon
    #11
    No, that's the total cost. You pay that and shipping to send it to him. Return shipping is included in the price.
     

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