Although I agree with not touching anything inside the unit a fuse replacement is an easy fix. on most microwaves all you do is remove the cabinet and you should see the fuse in the open. use a fuse removal tool and replace it with the same voltage and amp fuse. DON'T TOUCH ANYTHING ELSE!!!! The capacitor inside the has enough voltage up to 300 volts to deliver a good zap. The magnatron from what I understand will kill you.