Had the same problem--the timer would even count down. The magnetron fan would not turn on, and the microwave would not heat.
Checked out several components, but ended up being just the door latch out of adjustment!
Be sure to discharge the capacitor before messing around in there. It keeps a charge even when unplugged. Short out the unused terminal on the capacitor to a screw in the chassis, using a short length of insulated wire.
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There three parts that will cause this, the first is the magnetron "heats food" the most expensive part, followed by the high voltage capacitor and diode, they work in conjunction to generate the high voltage to cook the food.
If everything appears to work as normal but does not heat, then the magnetron will be faulty. This is the device which cooks the food, however this can be an expensive part to replace & may not be economical to fix.
you may have gotten a power surge and that can cause some funny things to happen, 1st is there power to the oven, 2nd if so there may be an internal fuse protector built in to the oven, check with the manual for anything of that sort listed. if not you may have to take it in and have it repaired by a pro. there is a lot of voltage in these ovens and unless you know what you are doing a person could get hurt