Frigidaire microwave

Stopped working abruptly today. The clock still works and when I enter a time and hit Start, the clock counts down but it doesn’t make the typical noise and doesn’t heat anything. I didn’t notice if the turntable still worked.
I think this happened to us 4 or 5 years ago and it was a fuse or something.
Does anyone know what part I need, where I can get it, what it will cost me and how to install it?

Thanks