I am trying to uninstall an app, but the system will not let me because it is running in the background. Quit and Force Quit are not working. Restarting computer not working. What next?
iMac 24″, macOS 12.5
The forced-shutdown procedure is included here: Shut down or restart your Mac - Apple Support
After that, boot into Safe Mode: How to use safe mode on your Mac - Apple Support
...and see if you can remove the app.
Force Quit will only affect graphic processes - it doesn't affect background processes.
The easy way to force it is to reboot your machine - that obviously stops every process (although it may auto-start on the reboot).
The second way is to drop to the shell (via Terminal.app) and use the ps command to find the process ID, followed by the kill command to terminate the process (bearing in mind it may be set to auto-restart).
How do I quit an app if Force Quit doesn't work?
