Micro works but wont heat food

When it did heat food before and you used the same settings now, the microwave must be defect.
But before you are sure, put a cup with water in the micro and try to heat that.
Dry food can't be heated in a microwave. There must be some moist in the food if you want to heat it in the microwave.

From the description you have provided, the magnetron has shorted. This a job for a professional because there is lethal voltages present that will kill.

Its your Magnatron tube, thats what makes the microwaves and heats the food. The part will cost you more than a new micro. The new model that replaced yours is a JVM1540 and you can get them for 179.00

Micro wave as the name suggests produces heat when the micro waves aimed at an object causes the water molecules inside the object to vibrate hence producing heat.The gadget responsible is the magnetron. If your magnetron is not receiving ht voltage or receiving but faulty, then your micro wave wont work please take precaution when opening micro wave due to high voltage caps that remain charged sometimes even when it is off.check the high voltage fuse/ diode and capacitor if they are fine and the step up trans former o.k then the only option is to replace the magnetron

Replace the HV capacitor

give more time

The light inside the micro wave needs to be replaced most have a door on the back side that yo can remove the screw and unscrew the bulb and take to a applince shop and purchance a new one to replace.

Is this a combi oven? If it is not-and only a micro then there is no heating element. Try it on micro(if its a combi) with a mug of water for approx 30 seconds to test it. If its a combi-is the micro function still working?

Yes the microwave is safe to use, without the turntable working.

I have a GE Spacemaker Microwave, model # JVM1650WB008

The lights work and everything runs in a normal operation, it will not heat the food. I have changed the fuse and still the same, no heat.