It sounds just as normal when I switch it on, the light comes on, the turntable rotates and it pings! at the end - but food is stone cold. Hard to believe it's broken as everything looks/sounds ok. When I've had a microwave break before there's always been a flash and a pop but this was working fine til now. There is a tiny s1 appearing on the LED display along with the time counting down, and DH doesnt remember this appearing before, so he wonders if it's somehow been put on a different setting. We've tried the cancel button and various combinations but can't get it back to normal though. Any suggestions?