do mean the LCD or plastma graphic display goes 100% deadwhen door is closed, and not coolingmine shows TIME there, page 12 in your manualunplug Uwave from AC wall jack for say 30 minutesplug back in and he display asks for time, it must and was lost above.myGE WILL NEVER WORKs If TIME AND AM/PM ARE NOT SET first.THIS UWAVE HAS CHILD LOCK FEATURES. and more oddities,HERE IS THE FREE MANUAL
https://www.manualsdir.com/manuals/453553/panasonic-nn-sn797s.html?page=12AND PAGE 13 ALL OFF THAT page (settings)it EVEN sets CLOCK OFF odd demo modes and more, read it all.IF KIDS PLAYed HERE, THERE ARE MANY THINGS THERE TO GET WRONG ,SO PULL THE AC CORD, FOR 1HR OR MORE. IF IT FAILS TO RESET, LIKE PULL ac CORD OVERNIGHT,.gOOD LUCK. (yes way over too complex)