can i fix my microwave?

My Kenwood ST/SS25 packed in after 2 years of careful and light use (maybe used it twice a week, mostly for reheating tea and simple 3-min warm-ups of leftover food). Does everything except heat up - turntable turns, programming works, makes same noise as it ever did, but the food comes out still cold. No clues as to why, it just woke up one morning and decided it wasn't going to work.