light on cpap

silly question, can't find a reference to this in the manual.
had the trial machine for 2 weeks, now just bought my own. the green light is on when its in off position. when I turn the cpap on the blue light comes on(on the on/off dial) but it doesn't stay lit...I seem to remember on the trial machine this blue light stayed on all the time the machine ran....should I worry abt this?

This is normal for this machine; the light times out so the blue light won't disturb your sleep.
If you want to see the display, tap one of the rectangular silver buttons once.
Lab machines may need to stay lighted for monitoring.