Why is my computer monitor doing this? Corrupted screen

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Screen Shot 2015-04-15 at 12.40.57 AM.png Every now and then I geta very pixaleted corrupt screen. It not the whole screen but par of it then I close a tab and it goes away. Happens on main scree too. Please help
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
You need to test your machine to see if it's the graphics adapter or something else. The best way to do that is to attach an external monitor or TV. If it does the same thing, it may be the graphics adapter.

Also, when you post a question to a forum you should include your Mac (year and model) and what version of OS X it's running. This is so we can better answer your questions.
 

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