2019 27" iMac Flickers upon Wake up (amended with video)
I've tried: restarting; resetting the PRAM; Big Sur 11.4 up to date; ran Disk Utility - no issues;
Flickers at approx 6 secs, and blacks out briefly at 8 secs...
Suggestions/ fix please...
Included link to video, first post didn't show up, looks like it did this time!
https://www.hooliganunderground.com/IMac-Screen-Flickers/n-s4s98R/
iMac 27″, macOS 11.4