Can you measure the current draw from your power supply to the QMX in the following three conditions:
1 - while QMX is powered off (remove power cord, then replace it to make sure QMX is off).
2 - while you are pressing the power-on button?
3 - after you release? the power-on button (which is when it should be powered on).
?
That will help determine what state your QMX is in.
