Did a little research prior to opening the microwave up. Microwave has to be taken down for repair and then hung back on the wall after repair. Would recommend using 2 people for this job. Checked the 3 thermocouples, one at the top (normally closed) and two at the bottom (one is normally closed and one normally opened). All three checked good. Checked both fuses, found the fuse marked Main Fuse to be blown. Fuses blow because of a problem, did some digging. Prior to the microwave going out there were noises best describe as "baseball card hitting against the spokes of a bicycle wheel". Discarded high voltage capacitor and checked it. Found the capacitor to be bad, used a Fluke digital meter. Capacitance showed "OL" when it should have been around "900", the ohms reading showed bad also. Everything else checked good. Also, keypad is on the door of this model. Keys were very difficult to operate or didn't operate. While doing the repairs for the power issue traced out the wiring for the keypad and found 2 modular connections. Worked these connections (unplug and plug) several times and scraped the pins gently. Microwave is now operating after replacing fuse and capacitor. Keypad is also functioning great.