Doesn't heat the food

I hope you didn't run the microwave with nothing in the cavity, if you did, it will damage the magnetron.
The turntable dishes do get hot depending on the quality of the glass used to make it. Heat is caused by impurities in the glass.
If you run it with no food in the oven, the glass will try to absorb the energy with atastrophic results usually.

Someone else had the same problem as you. The solution was posted here:

http://www.fixya.com/support/t16342323-ge_profile_spacemaker_1800_xl_microwave

call Chas&Son,s appliance repair at 570-379-0993 and they will come out the same day no less okay

If the sound is coming from the magnetron "heats food" it indicates failure within a short period of time. The only thing you can do is call an appliance repairman to check the oven out and verify the problem and cost.

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic Microwave Oven Troubleshooting Tips

heatman101

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Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

the magnatron is damaged,

Q - The microwave display counts down and the inside light is on,  but nothing is heating and the fan is not running.
A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
 Q - My microwave is running and sounds like it is working but will not heat up anything.
A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....
Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food?
A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.

Brent
The magnatron in your oven has gone out and will need replaced!( This is the device that heats up your food) If everything is working and your food is not getting hot 99.9 percent of the time its the Magnatron or its fuse! The loud humming is also a big clue the MAGNATRON has gone bad!
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If you sure that lauder sound comes from turntable motor than it needs to be replace.

I’m happy to help further over the phone at https://www.6ya.com/expert/vitaliy_f406165329c75ede