Mac pro display

edsneath Said:

"Mac pro display: how do I eliminate the black bar at the top of my screen. Mac Pro 2021"

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Scan you provide a screenshot, or a photo of this?

Troubleshooting a Black Bar on a Mac:

What to Try:

A. Try Safe Mode:

In Safe Mode, login items do not run, and corrupt system files(i.e. caches) are intentionally reset as a way to fix issues

1. Boot: in to Safe Mode: [Hold Down: shift key upon boot].
2. Log in: as same user
3. Wait: 30 seconds
4. Restart; your Mac
5. Log in: as same user

See if this now works

B. Try Another User:

Create a new administrator user, and see if you get this error. If you do, then it is likely an issue of the macOS as a whole. If you do not get this issue, then is it likely an issue with the users your are using while reporting this.

is this a black bar on the built-in display when no other displays are attached?

If something else, such as using an external display at the same time as the built-in display, please describe exactly what is connected and how it is connected.