iMac 2020 YouTube videos and Apple Music album previews turning green. Worst after 14.1 update.

HI Jack! I have not done a safe boot yet. I am trying to update more new issues but the thread won't let me.

Update: 20 minutes after writing this, the iMac went to sleep, and the screen was solid green. I woke it up, and most of the screen was normal, but the YouTube and iTunes previews are still green. I am posting this update and two screen grabs since I can't update my regular post. I have disconnected everything and done the pram and smc. Also, restarted in recovery mode with apple support and ran diagnostics with no errors. Is safe boot restart holding down space? Here are the screen grabs, if apple will let me! :O Oh, if I just do a regular reboot, the green will go away for a couple of hours then come back. It happens sometimes when scrobbing in video.

Now I can't edit my original post, so here is the updated one!

"A couple of hours after restart, youtube videos turn solid green. Can still hear sound, but then all other videos turn green, and itunes (apple music) album previews also turn green. Got much worst after 14 update. Have reset pram and smc 4 times. Apple support suggests reinstalling system OS fresh without wipe first, then I guess wipe after this. This computer has been nothing but trouble, and had to have the logic board replaced after 1 year. Has also been completely wiped 4 times. Have 32 GB of Other World Computing ram, and 4 externals plugged in. Also a dell monitor, but the green issues happen with it unplugged. Have run disc utility and scan with restart + D Any ideas? Thank you!

Update: 20 minutes after writing this, the iMac went to sleep, and the screen was solid green. I woke it up, and most of the screen was normal, but the YouTube and iTunes previews are still green."

Thanks for the idea. I have the original ram. Apple thought my ram was defective, so they put the apple ram back in, my old heating and fan issues persisted and they replaced the logic board. A apple certified store thought there might be an error on the first OWC ram I bought, so I sent it back for what I have now. No other troubles for a year, except for the recent green stuff. Got really bad after 14 update. It happened a bit before, but bananas now! I thought it might be the video card? Oh, also, I updated with 5 externals plugged in. And when the 14.1.1 update installed on Friday night, I got an error message saying the computer restarted because of a problem.

Thank you for listening to me.

I totally reinstalled 14.1.1 again last night with nothing hooked up. Green screen is now on videos right off the bat. No other monitor hooked up. Don't have time to switch out ram at the moment since I am working. Any other ideas?