2020 27" iMac display gets half opaque when shutting down computer

2020 27" iMac display gets half opaque when shutting down computer as seen below. I already went through disk utility to see if there were any issues, as well as erasing the drive and re-installing MacOS (Big Sur) and restoring from a Time Machine Backup.

Posted on Nov 30, 2020 3:23 PM

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47 replies

fjho2000 Author

Level 1

16 points

Dec 15, 2020 8:03 AM in response to ifd66

I just reset the PRAM, but will not shut it down until it finishes backing up. What I have noticed with my iMac is that it doesn't do that all the time, and if I turn it on and shut it down within minutes, I don't have the issue, but when its on for over 15-20 minutes or more, it has that issue. I will also see if there is a difference by turning it on in safe mode and leaving it on.

Apr 30, 2021 7:20 AM in response to fjho2000

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2020 27" iMac display gets half opaque when shutting down computer

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