My Frigidaire Dishwasher motor is not spinning...

Question

It all started few days back with a continuous humming sound even after the Dishwasher is off. That sound comes throughout the day. But the dishwasher was working okay that time.Now when I start the dishwasher it takes the water in but does not start the rinse cycle. The motor never starts. The hot air/steam comes but the detergent is never used. The machine continues all the cyles till it goes off but nothing happens. Thank you.