I'm having a bizarre issue with my early 2011 Macbook 15'. I grabbed it today without battery power só the first thing I diz was to plug the MagSafe adapter. Afterwards I pressed the power button. It chimed as usual but then I noticed it rebooted by itself after a few seconds then shutdown for good again.

I noticed by now pressing the power button had no effect. I tried resetting the SMC and the laptop powered for a few seconds then shut down again. After a few attempts I noticed the laptop remained on as long as I kept a key pressed (any key, like Option).

Since I can't boot by normally pressing the power button I can't do a PRAM reset.

Can anyone help me solve this mistery?

The laptop was serviced 5 months ago with a new logic board and new Keyboard...

  • Did you get it fixed? I have the same problem. And I wonder if it is mechanical or the logicboard. – user175931 Mar 18 '16 at 17:22
  • I got it fixed yeah. But it was a logic board issue. I got it replaced because it was still in the warranty. – Joao Neto Mar 18 '16 at 17:29
  • Could you update your accepted answer so as to confirm that a logic board replacement was the problem? – samh Mar 18 '16 at 20:31

I just found out it seems the power button is "stuck" and pressing option seems to prevent the laptop going into shutdown, as when I booted into El Capitan, a few seconds after I let the option key go, I saw the shutdown dialog for a couple of seconds... I'm going to take it to the repair warranty to recheck the keyboard topcase.

Update: The problem was with a faulty logic board power button circuit. In my case the whole board was replaced as it was still in the warranty period.

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