6 Replies Latest reply: Sep 3, 2012 5:21 PM by ALRUI
ALRUI Level 1 (0 points)

Hi Folks - Cant get my Macbook Pro to shut down (instead it does a re-start) thus the key combination for these re-sets doesnt seem to function (no chimes). I saw in another thread a terminal command entry "sudo nvram boot-args=”-p -r” but I also saw it mentioned that entering that casued the following to pop-up "Note that resetting the PRAM will wipe out the contents of the boot-args environment variable, which means the command would need to be reissued each startup." Whats with "reissued each startup"? Also would like a an SMC re-set command. THANKS in advance!

12" G4, 13" MBP, Various Other "Oldies"
  • Ego Ipse Level 1 (0 points)

    I have the same question...The terminal command for smc reset would be nice...

  • MacMan240 Level 1 (80 points)

    I dont know of a terminal command but here is how to reset the SMC:


    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.
  • MacMan240 Level 1 (80 points)
  • ALRUI Level 1 (0 points)

    Ive done that but none of my prefs. were changed theus I dont think it did anything at all, I also went ahead and followed the procedure for non removeable batteries by disconnecting the battery connector from the logic board with what seemed to be no effect. I would think there has to be a way to do this through the terminal. On the same not if I do the PRAM re-set using the keyboard I only get 1 chime then the computer starts up normally:-( As far as the link to thread 2172681 I believe this simply toggles the boot from verbose to not - its not really any kind of re-set from what I can see. Thanks for the input though!

  • MacMan240 Level 1 (80 points)

    You said you disconected the battery from the logic board but did you actually try pressing the (left side) Shift-Control-Option keys and the power button at the same time while it is plugged in to the power adapter?


    Message was edited by: MacMan240

  • ALRUI Level 1 (0 points)

    yep more then once:-)