I was heating water, heard a buzzing sound from the microwave for a second or two, then it died - no lights etc. I found the 20amp fuse to be blown, replaced it, tried to heat some water, but as I somewhat expected, I heard the buzz and it shut down. Is this buzzing sound a good clue to the issue, such as capacitor vs diode etc., or is this buzz just the typical sound of a fuse blowing?