Mackie External Power Supply for Select Ultracompact 0028090-00
ResMed External 90 Watt Power Supply for AirSense™ 10, AirStart™ 10 and AirCurve™ 10 Series CPAP and BiPAP Machines
A computer tower needing an external power supply. There is nothing behind the power supply "cutout". Basically a laptop motherboard in a case. Also, the card slots aren't removable. : r/techsupportgore