Mac Pro boot without video

Discussion in 'Mac Pro' started by fred_Mpro, Dec 3, 2016.

  1. fred_Mpro macrumors newbie

    fred_Mpro

    Joined:
    Dec 5, 2015
    Location:
    Montréal (QC)
    #1
    Hi,

    Mac Pro 4.1 8-core with 128gb RAM

    I have big problem with Mac Pro, yesterday in photoshop session the mac crashing and won't reboot. Chime and reset PRAM work fine but i don't have any video.

    In the Mac Pro i have GTX 970, my first diagnostic is Nvidia Web Driver just turn off so i put my original GT120, but i don't have video too.

    My diagnostic GPU LED : turn off so i don't understand. Motherboard is broke? I try my 4 PCIE slot without result.

    What i try :
    - RESET PRAM
    - RESET SMC with HARD BUTTON
    - GT7300, GT120, GT8800 APPLE
    - HD5870, GTX 970 NO-APPLE
    - TARGET MOD WORK FINE
    - MINIMAL RAM (4GBX1)

    Any idea? Thanks

    Sorry for my english, im french guys :)
     
  2. h9826790, Dec 3, 2016
    Last edited: Dec 3, 2016

    h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    So, you mean after the PRAM reset. You remove the 970, and install the Apple stock GT120 back in, connect the monitor to the GT120. When you press the power button, the Mac do have chime, but display nothing, isn't it?

    Anyway, did you check if the monitor / cable is working or not.
     
  3. fred_Mpro thread starter macrumors newbie

    fred_Mpro

    Joined:
    Dec 5, 2015
    Location:
    Montréal (QC)
    #3
    Hi,

    Reset PRAM lot of time before after same time... And yes it not monitor, or i have 13 bad monitor xD

    I think is the motherboard is just broke. The main board just can't recognize any GPU.

    thanks
     

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