Midtones and Shadows are dark

Images (still and video) have been really dark for the past month. The midtones and shadows fill in and lose detail. When I restart my computer, for a second or two my screensaver looks normal and then it goes back to being really dark. All my photos and streaming video have the same problem. Any ideas what the problem is and how to fix it?
Thanks

Are the brightness settings as they should be?
Also check the colours are set to how you'd normally have them in the color tab of display settings.

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