Problem with Whirlpool ADP962?

After a good few years of service i am having a problem with my dishwasher. The dishwasher was working fine until i came to use it the last time. The selector switch will select any programme but will not go any further. Even after pressing and holding start button. The machine makes no noise or give any clue as to what the problem may be. Any help would be appreciated. Thanks in advance.