PB 420E Stops - maybe?
If the display stays on but the GK420e stops blowing air, the machine is malfunctioning. You need to get it check out--contact the vendor and have it fixed under warranty.
As for power outages (which doesn't sound like the case here), two solutions I use are (1) plug CPAP (not humidifier) into a UPS (uninterruptible power supply--sold in computer stores, etc.), and (2) a power-off alarm, bought at Radio Shack, which is plugs into the mains and had a battery that powers an alarm that goes off if the mains power ceases--I use this when in hotel rooms, etc., where I do not have the UPS.
As for power outages (which doesn't sound like the case here), two solutions I use are (1) plug CPAP (not humidifier) into a UPS (uninterruptible power supply--sold in computer stores, etc.), and (2) a power-off alarm, bought at Radio Shack, which is plugs into the mains and had a battery that powers an alarm that goes off if the mains power ceases--I use this when in hotel rooms, etc., where I do not have the UPS.