2 Replies Latest reply: Sep 3, 2012 10:43 AM by MacMan240
Vic Yim Level 1 Level 1 (0 points)

mac book pro shuts down when unplug charger

  • 1. Re: mac book pro shuts down when unplug charger
    John Galt Level 8 Level 8 (36,365 points)

    Problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset:


    Resetting the System Management Controller (SMC)

    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 (to remove the battery - click here: MacBook or MacBook Pro).
    4. Press and hold the power button for 5 seconds.
    5. Release the power button.
    6. Reconnect the battery and MagSafe power adapter.
    7. 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.
  • 2. Re: mac book pro shuts down when unplug charger
    MacMan240 Level 1 Level 1 (80 points)

    Get the App "Battery Guard" from the app store. After download, open the app and click on the lighning bolt that appears in the menu bar. In the middle of the pop up, it will say Original max, and Current max, followed by a percentage. If the Current max and percentage is very low, you probably need a new battery. If you leave the MacBook plugged in alot when your using it, it will kill the battery life. Only plug in the MacBook when it needs to be charged and when it hits 99 or 100% unplug it until it is very low again. This will make your battery last a long time.