Microwave light turns on but no heat

 It sounds like the magnetron or the high-voltage capacitor inside your unit has completely failed. I had this exact same scenario happen with my built-in microwave last year. I didn't want to buy a new one because it matches all my other kitchen appliances perfectly. I decided to see if a repair was possible and reached out to Major Appliance Repair https://majorappliancerepair.info/ for advice. I am so glad I did because they offer very fast in-home appliance repair for all major brands. The technician was incredibly honest and replaced the faulty internal component for a very fair price. It was much cheaper than buying a whole new microwave and installing it. Definitely let them give you a professional quote!