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 https://www.insanelymac.com/forum/topic/327688-dual-monitor-setup-not-working/ 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 https://www.insanelymac.com/forum/topic/327688-dual-monitor-setup-not-working/#findComment-2505958 Share on other sites More sharing options...
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