Maytag Over Range Microwave not working

First yes, it is plugged in and receiving power. Having said that it is dead. No functions, lights - not even the inside light is working. Nothing.

The display has been noticably dim lately (1 month or so??). So - thinking it might be the control panel (wild guess). Queston - sound about right? And - worth fixing?

Unit is a little less than 3 years old - and I can replace it with exact equivelent for about $325.

Thanks!

Tom