Remove your top cover and sides, and they should all come off together. Follow where your AC wire comes in to power the unit. Somewhere inline there will be a thermistor fuse. It looks like a solid fuse with a couple of numbers written on it. This is a safety device that will go out for a number of reason's. Make sure your MW is unplugged and get a ohm meter and check for continuity between both sides. If it is open, you will not get power to the unit. You can cut this out with cutting pliers and go to a local electronic's shop and they can give you an exact replacement. You will need to replace and put it back exactly like you took it off. I have changed many for people and this little part is about $2 to $5 . This is 90% of the problems with these units.
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