Coloured lines on second screen (Not sure if hardware/software)

Discussion in 'iMac' started by Mewier, Jul 6, 2013.

  1. macrumors newbie

    Joined:
    Jul 6, 2013
    #1
    These lines have an about 50% chance of showing up after my iMac boots. If I restart my computer 1-3 times it will go back to normal, which is odd.
    The lines slowly wobble. I've searched and found other problems with odd colors, but nothing similar to this.
    My iMac is an late 2012 model, 10.8.4 2.9 GHz Intel Core i5.

    Help is appreciated. :)
     

    Attached Files:

  2. macrumors 6502

    Joined:
    Feb 2, 2013
    #2
    Have you checked the cable? Sounds like it could be a loose or bad cable.
     
  3. macrumors 68000

    Joined:
    Dec 17, 2009
    Location:
    Folsom, CA
    #3
    If the cable checks out OK (replace it) then run Apple Hardware Test in extended mode 2-3 times. If it is hardware then you will need to take it in for warranty service.
     
  4. macrumors G3

    Joined:
    Jul 23, 2002
    Location:
    Sol III - Terra
    #4
    Check not only the cable, but also check the connector on the display. Also, do you have something else you check the display on. Especially using the same connector on the display.

    It could be the iMac, the cable, or the display itself.
     
  5. thread starter macrumors newbie

    Joined:
    Jul 6, 2013
    #5
    Thanks for the replies! I did the test and it didn't find anything.
    I checked the VGA cable and noticed that the end that goes into the screen has only one functioning screw, while the other one won't go in. Can this be the problem? Or shouldn't that cause the problem to happen every time?
     
  6. macrumors 6502

    Joined:
    Feb 2, 2013
    #6
    VGA? That iMac has a Mini Display Port (Thunderbolt Port). Are you using an adapter and additional cable?

    If the finger screws can't be tightened or even go in it's probably a bad or damaged connector right there. Check closely that no pins are bent on that connector cable.
     
  7. macrumors newbie

    Joined:
    Jul 7, 2013
    #7
    great.do you have something else you check the display on. Especially using the same connector on the display.[​IMG]
     
  8. thread starter macrumors newbie

    Joined:
    Jul 6, 2013
    #8
    Yes, I am using an adapter.
    This is occurring less frequently now, but I'll try switching the vga cable out.
     

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