If the line shows up in the screenshot that would indicate a graphics issue. If the line does not show up in the screenshot that would indicate a display issue.
If the line shows up in the screenshot that would indicate a graphics issue. If the line does not show up in the screenshot that would indicate a display issue.
I understand from your post that a large black vertical bar has appeared on your MacBook Pro display. I suggest resetting the NVRAM, which will assist with display resolution:
This thread has been closed by the system or the community team.
You may vote for any posts you find helpful, or search the Community for additional answers.
black vertical line on screen
Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.