Vertical blue lines over black screen at startup and lockscreen

Discussion in 'iMac' started by Jara2212, Aug 19, 2017.

  1. Jara2212 macrumors newbie

    Jara2212

    Joined:
    Aug 19, 2017
    #1
    Hello, a few days ago I locked my imac screen and got a black screen with blue lines instead of the lock screen where I usually write my password (pic #2). The only solution I found was to restart the computer but, everytime, it starts up with a similar glitch screen (pic #5), sometime if I'm lucky (1 out of 5 times restarting) it starts up with the same glitch screen but then it displays my user logo behind the blue lines so I can put my password and everything looks normal again (pic #4), but if I lock my screen again (cmd+shift+eject) I would get the same glitch screen as when I restart it. I couldn't find any solution, please help. Thanks.
    [​IMG]
     
  2. SaSaSushi macrumors 68040

    SaSaSushi

    Joined:
    Aug 8, 2007
    Location:
    Takamatsu, Japan
    #2
    Vertical lines are an almost certain sign of a failing video card. Unfortunately, if so there are no easy or inexpensive fixes.

    What year and model is it?
     
  3. Jara2212 thread starter macrumors newbie

    Jara2212

    Joined:
    Aug 19, 2017
    #3
    27-inch, Late 2013
     
  4. SaSaSushi macrumors 68040

    SaSaSushi

    Joined:
    Aug 8, 2007
    Location:
    Takamatsu, Japan
    #4
    My best guess is either a failing GPU or an LCD panel gone bad. If the machine is not freezing, crashing, rebooting, more likely the latter. Either one is a very expensive repair.

    I take it the machine doesn't have AppleCare? Do you only get the vertical lines at the login screen? No glitches while in use?
     
  5. Huddy macrumors member

    Joined:
    Oct 9, 2009
    #5
    As SaSaShushi states it's either a dying GPU or LCD failure. Without AppleCare that's going to be a very expensive repair sadly.
     
  6. jacklivehere macrumors member

    Joined:
    Oct 9, 2014
    #6
    I had similar issue on my iMac 5k 2014 i7 model. but only during startup. not on lock screen. It turned out to be Beta version of MacOS. Once I reinstalled without beta, every thing went back to normal.
     
  7. vyokyong macrumors newbie

    vyokyong

    Joined:
    Aug 16, 2017
    #7
    My iMac late 2009 had blue vertical line on screen and I thought that its VDO card had problem. I did back up with time machine. And did reset every thing back to factory default from HDD formatting and reinstall new OS-X online. Good thing was happened that blue vertical line was totally disappeared. The iMac late 2009 becomes normal. I think that the problem is caused by latest update of OS-X Sierra. Then I set my iMac late 2009 does not to automatically update OS-X in order to avoid this problem again.
     

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