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When I powered up my MacBook today an went to log in, I noticed a black rectangular box over the middle of the screen. I clicked in it and then it had a white banner along the top of it and I could move it around the screen. I powered my MacBook off after that fearing I’d been hacked … what is this??
MacBook Air 13″, macOS 10.13
Hi there Feliiiii,
If you are seeing this window when trying to log into your user account, one of your login items might be responsible for this behavior. These steps from If your Mac has a blue screen or other startup problems show how to check and remove login items on your Mac:
Test your login items
1. Choose Apple menu > System Preferences, then click Users & Groups.
2. Click your account name below Current User, then click Login Items at the top of the window.
3. Make a list of the login items—you’ll need to remember them later.
4. Select all of the login items, then click the Remove button.
5. Choose Apple menu > Restart.
6. If this solves the problem, open Users & Groups preferences again, add the login items one at a time, and restart your Mac after adding each one.
7. When the problem occurs again, follow the steps above to remove only the last login item you added.
If you are concerned about the security of your Mac, follow the recommendations outlined here: Set up your Mac to be secure
We hope that helps!
Small black pop up window when starting up
