Be aware that the wheel that makes up the entire floor of the grinding chamber is the part that rotates. There are two lugs mounted on this wheel that rotate freely, but they are not driven by the motor. There's a hole in the bottom middle of the disposer where you can insert an allen wrench (there may be a special disposer tool already in the cabinet) and turn the motor manually. If the motor does turn freely, but the disposer still hums and doesn't stat, that'll mean there's a problem with the motor's starter circuit. You or a motor repair shop could open up the motor and check the resistance of the windings, the centrifugal starter switch, etc., but your best value at this point, especially with an entry level model such as a badger 5, is to replace the disposer. If you get another one made by insinkerator you can install the new one in like three steps.