My DisplayPort output just went wonky (not sure if this is the right forum)

Discussion in 'Mac Pro' started by savoirfaire, Mar 31, 2018.

  1. savoirfaire macrumors 6502

    savoirfaire

    Joined:
    Nov 23, 2003
    Location:
    New England
    #1
    Hey, guys. I have a Mac Pro 4,1 (flashed) with a GeForce GTX680 2GB video card and an LG 34UM95 display. I've had this setup for over 2 years now. Today I was doing some work and then went to the kitchen to make some tea. When I came back the display was asleep, but when I moved the mouse, the right half of the screen was all scrambled and there was some artifact on the left side of the screen, though the left was still usable. I put the Mac to sleep and then woke it up, and the display just showed "out of range". So I forced a shut down and then rebooted, and it went back to the right side of the screen being scrambled. I shut down again thinking, damn, I hope the video card didn't die. I tried to boot up in safe mode in case it was a driver problem, but I just got the "out of range" message again. So now, I go and get an HDMI cable, disconnect the DisplayPort cable, and hook up the monitor by HDMI, and it looks fine. If I try to switch back, the right side of the screen is scrambled. There are no updates from NVIDIA. Does anyone know if this just a partial failure of my video card or could it be that the cable went bad? Thanks for your help! Damn it, I'm a doctor, not a computer engineer!
    --- Post Merged, Mar 31, 2018 ---
    The only real advantage of the DisplayPort as far as I can tell is that I can only run at 50Hz with HDMI, and I was running at 60Hz with the DisplayPort, but I'm not a gamer or anything so it probably don't matter practically speaking.
     
  2. ActionableMango macrumors G3

    ActionableMango

    Joined:
    Sep 21, 2010
    #2
    I'd try any or all the following:
    • If you have Windows or Linux, or even a different version of MacOS, boot to that and see what happens.
    • Try a different DP cable.
    • Reseat card and cables. While the card is out, blow the dust out of the fans and slot, and examine the connectors and cable.
    • If you are using Apple drivers, try the Nvidia drivers. If you are using the Nvidia drivers, try the Apple drivers.
    • Try the card in a Windows PC.
     
  3. savoirfaire thread starter macrumors 6502

    savoirfaire

    Joined:
    Nov 23, 2003
    Location:
    New England
    #3
    Well, I don't have a Windows PC, but I will try all the other suggestions...
     

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