I tried starting the microwave a couple more times and it finally went completely dead. The unit had no power to anything. I removed it from the wall, pulled the cabinet and under the control panel was a tech sheet with a diagnosis tree. I followed the diagnosis tree steps to the overheat thermostat on the Magnatron tube. The thermostat tested with a multimeter as open and it should be normally closed. I temporarily jumped the thermostat to see if the control panel powered up and it did. I assume the contacts on the normally closed thermostat failed. I ordered a new thermostat, so I will be able to confirm the diagnosis when the new thermostat is installed.:)