reset_system_management_controller_smc

MacBook is not booting / charging anymore

I just encountered this problem twice within one week so I quickly wanted to share the solution with you. So if your MacBook or MacBook Pro is just not rebooting or charging anymore then you will probably need to reset the System Management Controller (SMC). Here’s how:

Resetting the SMC on Mac portables with a battery you can remove

  1. Shut down the computer.
  2. Disconnect the MagSafe power adapter from the computer, if it’s connected.
  3. Remove the battery.
  4. Press and hold the power button for 5 seconds.
  5. Release the power button.
  6. Reconnect the MagSafe power adapter and wait a few seconds (the light should go green).
  7. Then put the battery back and wait another few seconds.
  8. Press the power button to turn on the computer.

Resetting the SMC on portables with a battery you should not remove on your own

  1. Shut down the computer.
  2. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
  3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
  4. Release all the keys and the power button at the same time.
  5. Press the power button to turn on the computer.

Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.

This should do it, and did it for me with an older MacBook and a newer MacBook Pro.

Source: Apple support page and krismacbook

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