I replaced a light bulb and notice some of the light socket had broken off possible due to age and heat over the years. I reapplied the power and there was a pop like a direct short around the bulb. I checked it, and yes the bulb was blown. When i opened the oven door i noticed the light did not come on. And when I went to heat up some water the fan did not come on with the microwave. I checked the fuse and it seemed good. But, not wanting to take a chance I replaced the fuse and still not lights or fan. WHAT DO YOU THANK……….?