Resolution for Quick Connect Power Nozzle: If you're vacuum is 2001 prior, chances are one of the two contacts in the power nozzle elbow have let go.
The elbow can be disassembled by removing the two screw covers. You will need a flat head and small star. Also, you need to release the retaining clip on the back of the elbow. You will have to remove the elbow completely if it needs replacement. You will then have to remove the top cover of your power nozzle. That is easily done by removing all screws in the bottom base of your nozzle. Once you remove your cover you should see 2-4 screws holding in the elbow
When you remove the cover, you will see metal contact rings and two contacts. If one of them isn't contacting the ring your power nozzle will not turn on. You can try shaping it back into place but from experience the new revised elbow that does away with that kind of connectivity is a lot more effective. The new elbow runs about $40-$60. Between eBay and Aerus Electrolux Dealer. http://www.ezvacuum.com/electrolux-power-nozzle-elbow-assembly-graywhite-p-3542.html