Monitors Randomly go Black

Discussion in 'Mac Pro' started by tobiasenstrom, May 2, 2019.

  1. tobiasenstrom macrumors newbie

    Mar 30, 2018
    I've been using 3 screens without any issues but when I add a 4th it goes a bit wonky.

    All 4 screens randomly go black and then come back. They all do it at the same time.

    Details are:
    • The graphics card has 5 outs. 2 HDMI, 2 Displayports and 1 DVI.
    • I've been using 2 Displayports and 1 HDMI
    • When I add the 4th I'm using the 2nd HDMI.
    • They are all going to VGA inputs on the monitors
    I have switched the 2 HDMI monitors to see if it's the output of the card. It's all ok with 3 but when I add the 4th the same problem occurs

    Graphics copy.jpg system copy.jpg
  2. crjackson2134 macrumors 601


    Mar 6, 2013
    Charlotte, NC
  3. tobiasenstrom thread starter macrumors newbie

    Mar 30, 2018
  4. h9826790 macrumors G5


    Apr 3, 2014
    Hong Kong
    Any spare hard drive to try High Sierra / Mojave? The RX570 has more mature driver support in later OS.
  5. tobiasenstrom thread starter macrumors newbie

    Mar 30, 2018
    I down graded from High Sierra to Sierra so I could still run Logic Pro 9 as a 'just in case'.

    I don't need all 4 monitors on at once. As long as there are no more than 3 monitors on at a time, it all works fine. Just would have been nice though.


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5 May 2, 2019