Strange noise, no heat
Sounds like the magnatron has failed. This is the component that produces the microwaves that heats the food.
The cost of the magnatron is about 95% of the cost of a microwave oven.
Most people don't, for this reason, replace the magnatron, they replace
the whole oven.
There is a possiblity that the circuit that provides power to the
magnatron is faulty and you need to take it apart, find the proper
electrical leads and test them with a volt meter. To do this you have
to remove it from its mounting and take it appart. It is a fairly
lengthy process however.
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