Whirlpool microwave. Hello, this is my problem: I used the microwave yesterday in the morning and

Question

Hello, this is my problem: I used the microwave yesterday in the morning and went to use it the afternoon it worked. Tried to use it about 5 minutes later and it had a funny noise coming from behind the digital clock like a humming noise. Like it was trying to heat up and quit. Everything still works except now you push the start button it humms and won't heat up. The warranty is up and just need to fix. thanks