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If the microwave oven is 10 years old then it is time to consider a new unit, by your description it is going into cascade failure where different parts have stopped working, the buzzing sound is the magnetron warning you, it is about to fail. The fans job is to keep the magnetron cool while it is running.
It looks like the part of your computer board on microwave which responsible for controlling light and fan stop working. In this case you have to replace computer board.
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