Blank screen on Dell 5K

Discussion in 'Mac Pro' started by alphaod, Jan 31, 2016.

  1. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #1
    I've looked online for fixes including things like disabled sleep on the display, disable monitor sleep in OS X and that seems to have fixed my issue until I upgraded to 10.11.3 and now my display just doesn't work in OS X anymore.

    In fact I can't get it to work with my Mac Pro or my 15" MacBook Pro, whereas it was mostly no problem before (after doing the all the stuff above). Now, when I boot up the computer, and it will just be blank, so I can't see the login screen or anything. But if I boot into Windows [10], it will work perfectly.

    Any ideas?
     
  2. MacVidCards Suspended

    Joined:
    Nov 17, 2008
    Location:
    Hollywood, CA
    #2
    Either post some details or you can't really expect answers.

    GPU, how connected, which mode Dell is in, what you did that broke it..., etc.
     
  3. alphaod thread starter macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #3
    Mac Pro 2013 model
    D500 GPU
    Dell monitor is in 5K mode.
    Connected via dual mini-DisplayPort cables. I have tried all the possible combination of Thunderbolt ports and none of them work.

    Broke when I upgraded to 10.11.3

    I can see video if I connect a regular monitor. 5K display works in Windows 10, no issues.
     
  4. Mikael S macrumors newbie

    Joined:
    Apr 25, 2015
    #4
    I also have that screen and a nMP.

    Usually I find that disconnecting the power cable from the monitor and waiting a few seconds helps.
     

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