I have replaced both the Console Assembly and the Control Board for this dishwasher before on separate occasions. The Dishwasher worked for several months but now again it will not respond to user controls. This again happened immediately after a power failure. Now if you turn on power the display shows PF but if you select "normal wash" then "start" and close the door. The display goes blank and nothing happens. What is causing this and should I replace something else to prevent future failures?