Cuisinart Food Processor DLC-8Plus?

Even though the work bowl is fully locked into position which engages the motor when the ON switch is depressed, the machine will not run. I have removed the bottom cover and have manually moved the blades in the motor observing that there is no obstruction. Also, I have observed that no wires appear to be disconnected or "burned." Is it possible that there is a problem with the Restart feature of the machine? If so, is there a replacement part? Does this number help--BO869894? The processor was purchased in the '80's.