Press these three keys together: Option, Command, and Esc (Escape). Or choose Force Quit from the Apple menu  in the upper-left corner of your screen. (This is similar to pressing Control-Alt-Delete on a PC.) Then select the app in the Force Quit window and click Force Quit.

How do you force quit an application on a Mac?

Press Command-Option-Esc. You may be able to find “Force Quit” in the Apple drop-down menu. Use the “Force Quite Applications” menu to shut down an erring app. You’ll find Activity Monitor in the Applications’ Utility folder. Once you’ve found the app, click the “x” icon at the top of the list.

How do I stop background processes on Mac?

Click the Apple logo in your Mac’s menu bar. Click Force Quit. Select the application that has frozen, then click the Force Quit button to end the task. Confirm this action by clicking Force Quit again when prompted.