Remove GFX card, uninstall all graphics drivers, and run PC with onboard display port after everything's been disabled. Reinstall as if the GFX card is new, and install drivers. Check if this works.
Reason? "updating" or "rolling back" doesn't always remove/update borked files, specially if they still seem in tact. A fresh install (pretty much "formatting" of the GFX drivers) can fix this if the borked file is removed.


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