iMac black screen on boot, chimes ok

Discussion in 'iMac' started by lunaradmin, Mar 30, 2018.

  1. lunaradmin macrumors newbie

    Joined:
    Mar 30, 2018
    #1
    Hello, I am looking for possible causes for my issue and/or some troubleshooting steps...

    iMac boots to black screen
    Chimes correctly
    Can hear hard drive spinning
    Fan is running very fast
    Cannot see anything (faintly) on screen
    External monitor works fine (can see Apple logo etc.)

    Reseated RAM, reset PRAM
    Could it be a bad LCD connection or cable? What about the graphics card?
    Anything would be helpful. Thanks in advance.

    lunaradmin
     
  2. jerwin macrumors 68020

    Joined:
    Jun 13, 2015
  3. nambuccaheadsau macrumors 68000

    nambuccaheadsau

    Joined:
    Oct 19, 2007
    Location:
    Nambucca Heads Australia
    #3
    Shine a torch on the screen and see if there is anything viewable this would indicate a backlight problem. Regarding diagnostics must be a late 2013 or newer to run this otherwise you will need Apple Hardware Test. Always helps to provide Mac and operating system details.

    If you need AHT, go to this link, select the precise model using another Mac, download to desktop and burn to a thumb drive. Must be a Mac and not a Windows machine.


    https://github.com/upekkha/AppleHardwareTest
     

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