black box

cvwyn Said:

"black box: Hi I have a black box that has appeared on my Macbook and also the second monitor. Its sits just at the bottom of the screen. I can move apps in front of it. I have tried the voice over fix but this is already disabled. Any ideas? Thanks"

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Fixing the Back Box:

If it is being mirrored, then it is not a hardware issue, but rather a software issue. So, a macOS reinstall may fix this.

Five Things to Try:

A. Try Refreshing Finder:

1. Go to: Apple menu
2. Select: Force Quit...
3. Select: Finder
4. Click: Relaunch button
5. Click: Relaunch button

B. Single Out this User:

For temporary use, create a new administrator, seeing if you still get this error. If so, then it is an error in the macOS. If so, then it is an error with the current user. So, what you would do is trasnfereverything over to this new user, and then trash this current user.

C. Restore from a Backup:

Do you have a Time Machine Backup of your Mac that you created prior to this? If so, restore form it. If not, take this as a learning experience, knowing to always create a Time Machine backup of your Mac prior to making any major change to is (i.e. macOS upgrade), so that you can have something to restore your Mac from, should anything go wrong with the reinstall.

D. Boot into Safe Mode:

Hold Down the Shift Key upon boot. Once at the login screen, release shift. See if it all now works. In Safe Mode, only necessary items load (i.e. the caches), and new preferences are set aside.

If nothing above works, then...

E. Reinstall the macOS:

Nothing would be lost, it's just that sometimes changes are made to your system, and then then processes become corrupted, technically. When reinstalling, deleted files are reinstalled, and misplaced files are moved back to where they should be. Go Here: How to Reinstall macOS from macOS Recovery - Apple Support