Unable to reset SMC

Discussion in 'MacBook Air' started by michaelshaw, Dec 19, 2012.

  1. macrumors newbie

    Dec 19, 2012
    My Macbook Air is exhibiting a number of symptoms consistent with the need to reset the SMC (keyboard backlight erratic, shutting down when closing the lid instead of sleeping). However, I have another problem which seems to render the SMC reset process useless...

    I am unable to startup my MB with the power cable attached. It will only boot once it is unplugged and running on battery. The SMC reset process requires the laptop to be plugged in whilst holding down the Shirt-Control-Option & Power buttons. I've tried the process both plugged in and unplugged and neither has any effect. My laptop still shuts down when I close the lid.

    Pain in the proverbial. Anyone have any ideas? Thanks in advance for any help. Michael.
  2. macrumors 603


    You should try the following but you need to do this with two persons.

    You should hold these keys before the second person attaches the MagSafe Power.

    Press the (left side) Shift-Control-Option keys and the power button at the same time.
  3. thread starter macrumors newbie

    Dec 19, 2012
    Thanks for the advice, but alas no change.
  4. macrumors 603


    The next thing you can try is to open the MBA and disconnect the battery, then press the power button for 10 seconds.

Share This Page