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When I start up my iMac, I am greeted with the screen flashing on and off. I have to restart to get the second monitor to come up with the desktop. This just started, and I have had this monitor for years. I recently upgraded to the last version of High Sierra, but that has been awhile. This behaviour just started.
Ideas...?
Sounds like the monitor is failing.
Get help with video issues on external displays connected to your Mac
https://support.apple.com/en-us/HT201177
Sounds like the monitor is failing.
Get help with video issues on external displays connected to your Mac
https://support.apple.com/en-us/HT201177
External Monitor Not Recognized
