Microwave wont heat

Went to use microwave then heard a loud pop noise. Stopped microwave did not smell anything or see any physical damage so i retried microwave. It was louder than usual but everything seemed to work. I removed item i was trying to heatup and it was still cold. Tried again and found out microwave will not heat but everything else works. Unit is 7 years old. The manual has 4 models on it CGLMV169----GLMV169/ CPLMV169—PLMV169. Any help with this matter would be greatly appreciated. Thanks.

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okay. What would cause the loud pop when it stopped working?