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Second display only showing blue screen

B

bisk

macrumors member
Original poster
Sep 2, 2009
34
1
I have a second display (Dell ST2410) connected to my 27" iMac via a Thunderbolt 3 to HDMI cable. This was working fine in macOS 10.14.x, but since updating to Catalina it's only showing a blue screen. If I disconnect and reconnect the cable I do see my desktop background display quickly before the screen goes blue. If I open Settings and go to Display, I can see that the monitor is being detected as well. Does anyone have any ideas on how I can correct this?
 
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