Lg LMV1630st stainless steel microwave oven. The microwave won't heat. Everything else works. It's

Question

The microwave won't heat. Everything else works. It's 1-1/2 yrs old. Can you help? Thank you.

Will not heat. Everything else works: Turntable, interior Lights, stove-top lights,vent fan, clock, & timer all work. I tried to reset by shutting offthe power at the breaker, waited 10 minutes and turned breaker backon, but did not help. LG Brand Mod #LMV1680BB, 6 weeks old, still in the 90 day warranty