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...