GPU problem, colored squares on the monitor and pc freeze

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Mac Screen Problem: Flickering, Weird Colors, Glitches & Bars/Lines (27-Inch iMac late 2013)

Screen is scrambled with colored squares, PC freezes, what causes this? : r/techsupport

hardware failure - Did my graphics card (GPU) burn out? - Super User

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How to Fix Black and White Squares on the Computer Screen

How to Fix Discoloration and Distortion on a Computer Screen

Screen has a bunch of colorful squares on it and then crashes - Windows - Linus Tech Tips

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