Okay, your problem is what they call the "smart board". It has gone stupid for whatever reason. This is the board that receives inputs and tell the microwave what buttons you have pressed. replace tis board and you will be good to go. I am sending you a link and the smart board is #13 on the diagram. I am also sending you a picture of what the board looks like. I am here for further assistance and thank you for your time and patience, Randy.
You will have to take the front vent cover off by removing the screws in the top front of the microwave. Then drop the control panel by removing the screw that holds it to the microwave. Once that is done you will see the board to replace.