budest Posted September 28, 2017 Share Posted September 28, 2017 Hey guys, Successful upgrade to HS bar a minor issue and that is that I can't have dual monitors running as I did with Sierra. I can only have one monitor connected at a time. If I connect the second monitor when the first is working fine the first monitor switches to display the second desktop and the second monitor just displays a black screen. When I disconnect the second monitor the first monitor reverts to displaying the main desktop. Hope that makes sense.It's a weird one.Prob should have noted that I am using a AMD Radeon 7 Series card with HDMI & DVI connections. Worked flawlessly in previous versions of OSXAny ideas? Link to comment Share on other sites More sharing options...
foxlet Posted October 1, 2017 Share Posted October 1, 2017 It seems I have encountered the same issue under macOS 17A365 with a Radeon R9 270x, although my desktop remains on its own screen and the secondary display draws pure black. It's a regression from macOS Sierra where the second monitor worked properly. Link to comment Share on other sites More sharing options...
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