imac 27" with horizontal line at startup

Discussion in 'iMac' started by katrienv, Feb 18, 2017.

  1. katrienv macrumors newbie

    Nov 23, 2016
    I have a imac 27"
    mid 2011

    Had problems when starting, white screen and become very hot.

    I opened the imac, it was full of dust. So cleaned it out completely.

    After that I started the imac up without a problem.

    The only one weird thing is that at startup I see the apple logo with the status bar and then for 2 seconds a horizontal line.

    after that I can login and work with it, but I haven't seen this before.

    Is it the graphics that is dying?

    (a picture says more than 100 words :) ) 2017-02-18 15.52.30.jpg
  2. hsotnicam8002, Feb 27, 2017
    Last edited: Feb 27, 2017

    hsotnicam8002 macrumors 6502


    Mar 13, 2008
    United Kingdom
    --- Post Merged, Feb 27, 2017 ---
    I have the same iMac with a similar problem. The Apple Hardware Test showed no problems. After attempting to start it over a 7 day period using various key combination I eventually managed to get to a an Apple internet recovery screen and erased the disk followed by a clean a stall of Sierra. It started normally. Then I opened Safari and YouTube. While playing a Youtube video the sound locked on and the computer locked. I restarted the iMac and I'm back to the white screen and can't get passed it with any startup key combinations. I can use CMD s. The only software on the iMac is that installed during the clean installation of Sierra. Any ideas?
  3. katrienv thread starter macrumors newbie

    Nov 23, 2016
    It's the graphics card. I watched also youtube video, white screen, not starting up now.

    I changed the graphics card and up and running again.

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