HelloCustomer More then likely your magnetron is no longer fucntioning. If it still seems like the machine goes through the motions but doesn't heat it's normally the Mag/diode. You need to check your owners manual alot of these have coverage for up to 10 years. If for some reason your machine is not covered you would not want to repair it. Magentron cost around $90 and labor around $200. Check your manual and see if your still covered. We'll keep our fingers crossed. If it is covered call the number in your owner's manual and there'll take care of you.