Original, OEM 90 watt Power Supply brick works with the following models:

ResMed AirSense | ResMed AirCurve | AirSense Auto | AirSense CPAP | AirCurve Auto

ResMed Item number 37344. 

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.