imac 2010 Black Screen, External Display working

Discussion in 'iMac' started by perth2000, Apr 9, 2015.

  1. perth2000, Apr 9, 2015
    Last edited: Apr 9, 2015

    perth2000 macrumors newbie

    Apr 9, 2015

    I bought a mid 2010 iMac off a guy.

    It's a somewhat nice machine (27", i7, 8GB RAM and 2TB HD)

    The internal screen is not working, I thought I could fix it.

    I did these symptom checks:

    - On startup I can hear the chime

    - Brightness settings are ok

    - Reset SMC done

    - External display works fine, can use machine normally

    - took out display and reseated all the cables

    - Only 3 of 4 system check LEDs are on. They turn on 1,2,3 and then nothing. However the 3rd LED seems located right next to the Memory slots, and I am not sure where the 4th LED is.

    - I shined a bright flashlight on the screen. I could not see anything, totally black

    At this point I suspected the display to be dead.

    So I bought a used but working 2010 27 inch lcd (with the same numbers) of ebay.

    The seller seemed genuiine and told me the lcd works, it is just slightly dimmer on 1 side.

    So I got that LCD today, installed it and still: Nothing.

    I cannot run AHD because I cannot see the promts on the external screen.

    Does somebody have an idea what else I could do?

    And- Can I run AHD when the internal screen is not working?

    Kind regards,


  2. perth2000 thread starter macrumors newbie

    Apr 9, 2015
    so, i coming back from the Apple store.

    They ran some tests and it came out as:

    - no fans detected

    - no sensors detected.

    Possible motherboard fail.

    they are now ripping the thing apart and give me a quote.

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