Why the Kenwood processors will not turn on at all. From what ive read it is usually because the bowl is not fully locked into the machine. There is a safety interlock switch on these that will not allow the motor to start unless the bowl is in the correct position. The other issues ive seen is wire connection inside the base of the machine. It could be the on off switch, it could be a bad diode on the control side of the machine. The safety lock switch on these could also break. A faulty motor is also on the list of potential issues although this is usually if all else are ruled out. Finally, the fuse in the plug could be blown. This will turn off the machine completely though so people tend to not think of this.