Loud popping noise heard, everything works but no heat

From the descriptions it likely the magnetron has failed. If you have a digital multimeter post me a comment and I will give instructions to do a rough test.

Hi,
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heatman101=--=

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Basic Microwave Oven TroubleshootingTips

heatman101.,/,/

the magnetron. is what heats

In all likelihood the mangnetron has failed, or perhaps even the Power Supply. You need to have it serviced by a reputable service centre/man. Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.

Did it make a loud pop like a firecracker?
Sounds like the High Voltage Diode shorted out and it probably is making a low or loud growling noise now..... ???

HI, the sound you herd was the noise filter and running diode. these important components have failed at this point. you will need to replace these components asap, if possible. this will fix your issue.

The Magnetron Cut-off fuse will need to be replace as well. this will blow if there is a malfunction within the unit.

I have a GE Profile Spacemaker model JVM3670WF001, purchased I think in 2003. Pop sound, no Heat. Light goes on, carousel goes around,
Repair or new microwave

The magnetron is bad. Probably cost about $50 or $60 for the part. Not too easy to replace, but it can be done.

The loud pop was almost certainly the high voltage diode going bad. To find parts, I suggest you call the number on your owner's manual or check with the store where you bought it. Sunbeam may not make this part available, so be prepared. Maybe they have authorized servicers in your area. Ask them about that. Good luck.