Display problem - shows vertical black bar at all time. My MacOS is Big Sur 11.1
see attached screen shot.
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Boot into Safe Mode and try again. That can clear up some issues. Failing that, visual artifacts on an internal display are usually hardware problems and you’ll want to contact the folks at Apple Support and discuss your repair options: contact Apple Support to get more help. On an external display, there can be some other causes of display artifacts.
How to use safe mode on your Mac - Apple Support
Get help with video issues on external displays connected to your Mac - Apple Support