The Retina MacBook Pro’s Power Key
But the power-on key is actually a key on the keyboard now, and it too can be jostled and activated, thus booting up a machine stowed in a bag in the back of my SUV.
This is not a supposition; driving along with the MacBook Pro shut down and stowed in a bag in the back of my SUV, I occassionally hear the classic Mac startup ‘chong’ sound.