On that same label there is a MODEL number that we need to show you a parts listing of what parts may have failed. Hotpoint and GE are on in the same... the only difference is the brand name on the decals. Of course they use different model numbers.... Your model number will be similar to this: RVM1435BD001 I will use that as my parts reference model number as the interal parts that may have failed will be pretty much identical.
When a microwave just out of the blue stops heating usually the either the diode or the capacitor has failed.
See items 49 and 50 this link:
This unit also has 2 thermostats that can also cause it to stop heating. One actually controls the fan speed and the other is an over temp sensor that should shut off everything. The thermostat that controls fan speed shuts off the magnetron power on some units until the unit cools down and then it will work again.
If the magnetron has failed they usually make a loud buzzing sound when you turn on the unit from being cold. (Stuck oscillator) This can also cause the HV power diode and the unit fuse to fail.
Sears parts direct also has the parts for this unit here:
I change out the diode FIRST (after testing the old diode to make certain the diode has in fact failed.) I also test the capacitor while the diode is disconnected from the capacitor.
At this time I think you have a diode or a capacitor problem. If you have someone you know that can use a meter I can pass the information to them on how to test the diode and the capacitor so that you don't order parts that you DO NOT need.
If I got your model number wrong you can enter your model number on the displayed page of either link above. Or respond here with your model number and I will look up your unit.
Thanks for choosing FixYa,