No power is there a

The fuse is normally located behind the control panel or between the door switches.

There will also be a thermal fuse or thermostat on or near the magnetron and usually one on top of the oven cavity. If either of these is open, that will kill the oven until replaced.

If you or someone you know decide to look into it, we have critical safety and disassembly information at our site, as well as service tips, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

We're happy to help and we appreciate your thoughtful rating of our answer.