iMac late 2013 27" problem with display resolution

Discussion in 'iMac' started by SViK Pro, Jul 14, 2017.

  1. SViK Pro macrumors newbie

    SViK Pro

    Joined:
    Aug 13, 2012
    #1
    Hello,

    I have a problem after updating my iMac 27" late 2013 (NVIDIA GeForce GT 755M 1024 MB) to macOs Sierra. I cannot set the standard resulution of 2560x1440. If I select Display prefs it shows me <cannot remember>x720 and nothing more. When I press option key I see additionally 800x600. I have resetted nvram but after the reboot I see snow on display before the loging screen appear.

    Can you help please?

    Vladimir
     
  2. SViK Pro thread starter macrumors newbie

    SViK Pro

    Joined:
    Aug 13, 2012
    #2
    Hello,

    I have made a diagnostic and got two errors: VFD004 and VFD005. Seems that graphic card problem. But I never heard about such a behaivor. Sad. Does anyone have such a problem and maybe price to repair?

    Thanks
    Vladimir
     
  3. Fishrrman macrumors G4

    Fishrrman

    Joined:
    Feb 20, 2009
    #3
    Was it working properly in 10.11.6 (El Capitan)?
    If so, go back to using that...
     

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