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Screen flickering issue on the iMac Mid 2011

16561 Views 24 Replies Latest reply: Feb 4, 2014 12:03 PM by Cthulhu RSS
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3gs LS Level 1 Level 1 (0 points)
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Oct 3, 2012 10:59 AM

Hi all,

 

Does anyone know if Apple addressed this problem? I still get random flickering when the brightness is set fairly low.

iMac, OS X Mountain Lion (10.8.2)
  • BDAqua Level 10 Level 10 (114,800 points)
    Currently Being Moderated
    Oct 4, 2012 3:38 PM (in response to 3gs LS)

    I still see it mentioned from time o ime, so I guess not.

     

    Do you still have AppleCare on it?

  • baltwo Level 9 Level 9 (59,180 points)
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    Oct 4, 2012 4:10 PM (in response to 3gs LS)

    Contact Apple Service, iMac Service or Apple's Express Lane. Do note that if you have AppleCare's protection plan and you're within 50 miles (80 KM) of an Apple repair station, you're eligible for onsite repair since yours is a desktop machine.  Might also apply to new machines the first 90 days. BTW, the AppleCare Protection Plan's the best insurance policy available for desktop machines. Get it if you don't have it before contacting Apple.

    27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.2), G4 450 MP w/Leopard, 9.2.2
  • MrComputer Level 1 Level 1 (0 points)
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    Oct 7, 2012 3:56 PM (in response to 3gs LS)

    I have this too after the 10.8.2 Upgrade!

  • Justan Oldfart Level 2 Level 2 (255 points)
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    Oct 7, 2012 4:11 PM (in response to 3gs LS)

    I had that same problem on a mid 2011 refurb that I bought from the Apple store. I had to turn the brightness up full to torch mode to stop the flashing and flickering. As that was unsatisfactory I returned it to the store. Seems like backlight problems are not that uncommon with the late model iMacs. Baltwo has suggested the proper course of action for you to take.

  • Slapera Level 1 Level 1 (0 points)
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    Oct 14, 2012 8:22 AM (in response to 3gs LS)

    Same problem after 10.8.2 menu and safari page scrolling flickering on iMac mid 2011

  • Cthulhu Level 1 Level 1 (60 points)
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    Nov 1, 2012 8:48 AM (in response to Slapera)

    Ditto on my MBP running ML and connected to an external LED Cinema display.

     

    Tried resetting SMC, PRAM, re-installing, disabling auto-graphics switching, your name it, it's likely I tried it.

     

    The only workaround is to turn the brightness all the way up. I suspect the issue is still there, but I don't notice it because the bright light is burning into my retinas.

  • Nomax2001 Level 1 Level 1 (0 points)
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    Nov 8, 2012 3:27 PM (in response to 3gs LS)

    Hey, i have the same issue. Is there already a solution?

  • Cthulhu Level 1 Level 1 (60 points)
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    Nov 8, 2012 4:39 PM (in response to Nomax2001)

    Nope. But I do find I don't see the flicker if I 1) put my Gunnars on, and 2) keep the brightness at six of those little squares or higher. Apple was no help. They didn't see the flicker, and I was looking right at it saying, "Are you kidding me? You can't "see the brightness changing?!?" For the record, this is not subtle. It's bad enough that I simply can't work with the brightness low.

  • Cthulhu Level 1 Level 1 (60 points)
    Currently Being Moderated
    Nov 8, 2012 5:15 PM (in response to 3gs LS)

    3gs LS,

     

    I don't know if it is a hardware problem. My mid-2011 MBP does the same thing when connected to an external display as your iMac. It started the moment I upgraded to Mountain Lion.

     

    An identical MPB running Lion attached to this monitor does fine (no flickering). If I attach mine to another Cinema Display - flickering.

     

    That almost certainly means it's a software issue (or in my case I suppose the MPD external video hardware could be faulted), because the monitor is completely fine. The timing of my update, however, makes the software highly suspect.

     

    And one more thing - I am unable to reproduce this unless Safari is running (it does not have to be the active app). Perhaps it is something in the Automatic Graphics Switching, although I have it disabled, as well as the option to "Automatically adjust screen brightness."

     

    Please let us know how your visit to the Apple Store goes. If they fix it, I'm taking mine back in with a printout of this discussion.

  • baltwo Level 9 Level 9 (59,180 points)
    Currently Being Moderated
    Dec 14, 2012 11:07 AM (in response to 3gs LS)

    Did you turn it on at the store? If not, you should always do that to ensure things work as expected.

    27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.2), G4 450 MP w/Leopard, 9.2.2
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