Problem with my Navman s50

Question

I have a S50 series Navman and when I whent to put in a new adress I must have touched a wrong button or something because all I can now do is turn it on and it only goes to the safety agreement screen and when I press accept it then goes to a load map screen then comes back to the safety agreement screen.If you can help me it would be very much appreciated as I use my Navman a lot.