iMac 20" Not Starting, Motherboard or Video Card?

Discussion in 'iMac' started by iMavrick, Oct 12, 2014.

  1. iMavrick macrumors newbie

    Joined:
    Oct 12, 2014
    #1
    Hello everybody,

    I have just been given an iMac 20" (2210) from 2008 that does not start. When I press the power button, I can hear the startup Chime every 5 seconds since it keeps rebooting. I can also hear the fans and optical drive. However the screen remains black.

    I took it apart and I only have led 1 and 2 on. Both 3 and 4 remain off all the time. (led 3 is on for half a second when I press the power button)

    As I am now trying to figure out if it is a motherboard issue or a video card issue, I am in need of your help since both parts can be quite pricy compared to the value of the computer.

    The motherboard is a "820 2223 A" and the video card is an ATI "109-B22553-11".

    Thanks in advance
     
  2. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    LED 3 not turning on means the logicboard and video card are not communicating. You could try reseating the video card or replacing it.
     
  3. iMavrick thread starter macrumors newbie

    Joined:
    Oct 12, 2014
    #3
    Thank you Intell, but this is the answer I have been finding online all over, and it does not imply that led 4 is also off.

    I am guessing the video card could be the problem, but I was just wondering if any of you have experienced this before?
     
  4. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #4
    Yes, I've replaced a few video cards that have failed like that.
     

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