key button not working

Hi @fzengo

Sounds like there's a problem with the control panel assembly.

You could try opening the oven and removing the control panel and then check if you can open the panel to see what's wrong.

Alternatively search online for a replacement control panel. Search for DE94-03322M to find suppliers that suit you best. (examples only). This is the part number for the control panel in the oven

Be safety aware when working inside microwave ovens. The HV capacitor in the oven can store >5000V DC for months, even if the power has been disconnected for this length of time. This amount of voltage can seriously injure you. The HV capacitor needs to be correctly discharged as soon as it can be accessed after the oven's cover has been removed and before commencing any further work inside the oven. If you don't know what you're doing, then don't do it! Contact an appliance repair service and ask for a quote.