Reset the SMC

Notebook computers with a nonremovable battery

This applies to MacBook Pro models introduced in mid-2009 through 2017, MacBook Air models introduced in 2017 or earlier, and all MacBook models except the MacBook (13-inch, Mid 2009).

  1. Shut down your Mac.
  2. On your built-in keyboard, press and hold all of these keys:
    • Shift on the left side of your keyboard
    • Control on the left side of your keyboard
    • Option (Alt)  on the left side of your keyboard
  3. While holding all three keys, press and hold the power button as well.
    Notebook keyboard with all 4 keys pressed
  4. Keep holding all four keys for 10 seconds.
  5. Release all keys, then press the power button to turn on your Mac.
  6. TABLE OF CONTENTS