There are two safety switches on your Kirby. One is on the front of the unit and one is on the side where the bag attaches. If there is nothing attached to the front of the unit, such as your floor nozzle, attachment hose or shampoo system, the Kirby will not turn on. This is to prevent injury to you from the fan and prevent damaging the fan. There is also a safety switch on the side of the unit where the bag attaches, or the tank if you are shampooing. If the mini emptor or tank is not snapped tightly against the Kirby you will not have power. You need to remove the bag or tank and put it back on again and make sure it snaps tightly into place.