How to Restart a Frozen Mac

To attempt to save work in any applications other than the one you have running, you can force-quit the current application. Press these keys at the same time: Command-Option-Escape. Your unsaved work in the current application will be lost.
If you can, save work in all other programs.
Restart the computer by pressing the Power key or choosing Shut Down from the Special menu.
If that doesn't work, to shut down or restart the entire computer, press these keys: Command-Option-Shift-Power. All unsaved work will be lost.
To force the computer to restart, press these keys: Command-Control-Power.
If nothing else works, unplug the computer or turn off its power strip.
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