on opening, screen shows 7 8 9 0 ok in a numeric keypad, asking I presume for a pin number. I havn't given it a pin. HELP! I cannot move in about or around this screen. The numbers when touched turn blue, I press ok then the message sorry try again comes up after trying lots of combinations I am now in frustration mode. It only stays on this screen I cannot access anything else, can anyone help please?