Press the power button and when the dialog box appears, click the Restart button.
or, press Control + Command (+ Eject) and the Power button at the same time
Note: On PowerBooks, iBooks, and MacBook Pros the eject key does not respond immediately as it does on desktop keyboards. You must hold down the eject key for a few seconds, just as if you would be ejecting a disk.
If you don’t receive the email in the next 2 minutes please check your junk folder, and add [email protected] to your safe sender list.