iMac Mid 2011 Graphic Problem

Discussion in 'iMac' started by s-arash, Nov 17, 2012.

  1. s-arash, Nov 17, 2012
    Last edited: Nov 17, 2012

    macrumors newbie

    Nov 17, 2012

    8 months ago, my imac suddenly started to crash, the screen became black with vertical lines, the color of the lines and screen changed everytime, i checked the internet,apple hardware test said that my logic board and etc are working fine, after that i reset the nv/pram and smc,installed graphic firmware v.20, format the hdd and installed the mac os and windows again, but the problem didn't solve
    there's no applecare in my country, so i gave it to some local warrenty in my country, he said there's nothing wrong with logic board, i just needed a small service

    after 8 months, i'm facing the screen with vertical lines again, its usually happens during the game.

    what's the problem?

    iMac Mid 2011 27"
    Intel Core i5 3.10GHz
    4GB Ram
    6970M 1GB VGA
    1TB Seagate (checked it on apple hard replace, it was ok, doesnt need replace)
    Mac OS 10.7.0
    Windows 7 SP1 (Bootcamp)
  2. macrumors newbie

    Aug 7, 2012
    Problem like that is usually caused by GPU failure. Does your iMac have warranty left? If it does you should be able to get a replacement machine.

    If your warranty has expired then you're pretty much out of luck. If you are handy you could replace GPU yourself but Apple doesn't officially support it. 6970m GPU is also quite expensive (around $500 IIRC) and hard to come by. You might find a professional to replace it for you. I once asked a local guy ands he told he would charge about $50 for the job if I could provide him with parts needed.

    So last time you had this problem it was fixed when you took it for service? Maybe GPU is just overheating. Maybe there's some dust or something that affects GPUs cooling. You could take it for service again and see if they can do anything about it.
  3. macrumors newbie

    Nov 17, 2012
    I am having the same problem, I have the same computer and also run bootcamp. When ever I launch a game the display will crash on both Mac OS and Win7.

    I'm taking my iMac into an applestore on tuesday to have it looked at :(

    From what I can tell it is a graphics card issue, as I've reinstalled both OS' and drivers multiple times... I wish I could just open my computer, but I'd probably lose my applecare
  4. macrumors 6502a


    Nov 17, 2007
    It's a bad GPU. I'm ready to do a logic board swap on my old iMac G5 that was doing the same thing. I finally found a decent price on a logic board and bought the necessary tools. I want to try and run Opcode's old Studio Vision Pro on it.

    I just bought Apple Care on my 2011 iMac. I'm glad I did now!
  5. thread starter macrumors newbie

    Nov 17, 2012
    if its gpu problem, why apple hardware test says nothing about it? and how did they fix it 8 months ago?

    and about overheating, how to check my gpu temp in windows? i used many softwares they say wrong values in windows like 50669 but in mac its around 70-75 in normal state
  6. thread starter macrumors newbie

    Nov 17, 2012
    here is the image

    and DIY soloution? my warranty expired 1 month ago

    Attached Files:

  7. macrumors 6502

    Aug 27, 2010
    So by you not paying $120-$200 for a warranty to be extended for another 2 years this is what you have to deal with..... You my friend will learn the hard way.....
  8. macrumors member

    Sep 30, 2012
    Why would one need to buy applecare? Are iMacs that unreliable?
  9. macrumors 6502

    Aug 27, 2010
    I would say any piece of electronic without warranty is bound for failure. That could be a cellphone, tv, computer to even the computer in a car engine. I would not own a single piece of equipment without it being under warranty. If I do I know that it's on me if it fails.

    I just bought a new car and paid $2K for an extended 2 year warranty that covers tires, gap insurance, theft and some other bs I don;t even know. Point is, I pay for PEACE of Mind.
  10. thread starter macrumors newbie

    Nov 17, 2012
    as i said in first post, there's no applecare in my country
  11. macrumors member

    Sep 30, 2012
    Makes sense, just miss the good old days when everything just worked...

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