I am having trouble with my Emerson microwave. During reheating of a meal last Wednesday night it just stopped in the middle of the operation and has not worked since. I have tried to cook, reheat, etc and when you push the buttons, it acts like it is doing it but it never does. The cooking time counts down but the oven never turns on or starts. Is there a fuse or trip switch in the microwave that needs to be replaced?