How do I force my MacBook Pro to shut down?

Press and hold the power button to force your Mac to shut down. You can also force shutdown your Mac by pressing the Control+Option+Command+Eject keystroke combination.

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How do I shutdown my Mac instantly?

To reboot your Mac instantly, hit Control-Command-Power/Eject. To immediately shut down your Mac, hit Command-Option-Control-Power/Eject. To Log yourself (or any user) off of your Mac without using a menu or mouse, hit Command-Shift-Q.