Press and hold the Power button, and select Reboot.
Press and hold the Power ON/OFF (Sleep/Wake) button until a slider appears -> Move the slider to the right to power off the device
Press and hold the Power ON/OFF (Sleep/Wake) button again after 10-15 seconds, to turn on the device
Press the power button and when the dialog box appears, click the Restart button.
Your restart button should be around your power button. When you locate it, hit the button to restart your computer.
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.
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