Not sure why an app stopped responding on your Mac? You can always resort to Force Quit and start again. Keep in mind that you’ll lose any unsaved data.
How to force an app to quit
- Press these three keys together: Option, Command, and Esc (Escape). This is similar to pressing Control-Alt-Delete on a PC. Or choose Force Quit from the Apple () menu in the upper-left corner of your screen.
- Select the app in the Force Quit window, then click Force Quit.
