There was steam rising up from the stove into the OTR microwave and it was on at the time. It popped very loud like a spark/pop sound and now will not heat anything. The lights all work, keeps time, but the fan stays on high and will not go to a low setting. We have taken capacitor/fuses to be tested and they worked fine, now I just bought a magnitron tube and that didn't fix it either. Anything else we can try before purchasing a new one??? Thanks for any help.:(