Depending on the duration of the key press, you can send the machine to sleep, get the traditional shut down window, or invoke the forced power-off incantation,

Depending on the duration of the key press, you can send the machine to sleep, get the traditional shut down window, or invoke the forced power-off incantation, according to this support article [1]. The short tap-for-sleep method doesn't seem to work on the machine I'm using, either. [1] https://support.apple.com/en-us/HT201150 https://support.apple.com/en-us/HT201150