While I was changing a light bulb, I saw a spark and now the microwave won't work, the display panel is all gibberish, and the exhaust fan won't stop running. I unplugged the unit to let it cool down, but an hour later the same thing. The next morning the fan was still running and the microwave wont work. I tried to see if it was working, so i put some water in a mug and turned the power on, but after I opened the door the countdown continued on the display, but the turntable was not working, nor was the inside light. The fan, however, ran the whole time. Any ideas?

I just don't know. I unplugged the microwave overnight and it still doesn't reset or work. I keep hearing about a magnetron that breaks down in this particular model. Does anyone know if this could be the problem? The microwave is barely three years old. A great big thank you to anyone that can help me fix this.