Original, OEM 65 watt Power Supply brick works with the following models:

ResMed AirSense 11 | ResMed AirCurve 11 | AirSense 11 Autoset | AirSense 11 CPAP | AirCurve 11 Auto

MPN 39205

Is your machine not turning on? It could be the power supply. If the green light is not illuminated when plugged in to the wall, then it is defective and must be replaced. 

This is the OEM ResMed Air11 power supply. Aftermarket power supplies may not work due to the smart sensing technology of the Air 10 machines.