- Click the "Apple" icon in the computer's menu bar and select the "Shut Down ... " option from the Apple menu. Allow several seconds for the computer to shut down.
- Plug the MacBook's MagSafe power adapter into the MagSafe port on the side of the laptop.
- Press the "Shift," "Ctrl" and "Option" keys and the power button simultaneously. Release the all of the buttons simultaneously.
- Press and release the power button by itself to turn on the computer. The computer's SMC will now be reset when the computer boots up.