Mac screen glitched
So I was just watching some YouTube when my screen froze and I rebooted and now I have this glitched screen with a lot of colors on it. How do I fix it?
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What model and year is your Mac?
Have you tried booting into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Then reboot normally and test again.
If it's an older Mac it could be that the GPU has died.