There is a special demonstration mode the panel can be put in to by the sales people to draw attention when it is on display in the shop. Sounds like your machine is going in to demo mode when you press the power on button. Unless you know someone who can check, find & replace the faulty switch or remove the corrosion which may be another cause of the fault then the only other way is to buy & fit a new display board. Not the main controller board, just the one inside the panel for the switches & lights.
Lincoln Appliance NZ
November 2011