I don't see model numbers so I can't work this one out. You need to use the warranty or return period here. It's not good enough for you.
I got a 4k monitor and wanted to mess around so I got windows to run in 4k. I decided that I would only use it for games and switched back to 1080p and know my screen still has that weird fuzzy thing 4k gets. It now looks like trash, how do I fix this please

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