Lights Not Illuminating - Built-In Microwave

Does the light bulb need to be changed? 

If the microwave will turn on and is heating the light bulb might need to be changed.  Refer to your Owner's Manual for specific information for your model. 

Is there power to the microwave?

If the microwave will not turn on check to make sure their is power going to the microwave.  Check the following

• Verify the power cord is connected to an operational outlet.   If you are not sure whether the outlet is operational, and the outlet is easily accessible, connect a known operating small appliance with similar power cord to the outlet to verify the outlet is operational.
• Verify the circuit breaker hasn't tripped or blown a fuse.