No Auto Start for me.
My unit was set-up and programmed by provider, the 'auto start' or Smart Start feature is grayed out and not a usable menu item for me.
The way mine is programmed, it requires i turn it on with the start button.

Same problem here with my Resmed AirCurve 10 ST not starting. Have had unit about one month and last night it simply wouldn't start. As others here have indicated, my unit is powered-up, lighting and menus/controls all working as expected, am able to start the warm-up feature -- just cannot get the ...