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Boomish69

macrumors 6502
Original poster
Sep 13, 2012
402
109
London
Did the Mojave security update today when it rebooted my second screen wouldn't work, 1st screen is on a DVI, second is on a HDMI, I tried reboot, Pram reset, shut down & pulled power on Mac & Monitor, changed HDMI cable , tried putting it to sleep nothing worked, then I got a display port to HDMI cable and bingo it came back to life..

Never seen it before but in case others run into the same problem, this worked for me..
 
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