I own a Whirlpool Quiet Partner III dishwasher. All the buttons on the control panel are working, except for the start button. When I set the panel on diagnostic mode all buttons light up except for the start button. So obviously there are no other indications of trouble but the appliance doesn't start. I don't know if it's more likely a problem with the control panel (the start button itself) or with the control board (meaning, with the IC board).