Hi, I have Tom tom 910, it starts up and shows all the icons, when I touch the icon nothing happens, if I press too hard the screen changes and shows maps, and when I touch the maps nothing happens, I can't go in to the key board, pressing hard on the side of screen changes to different screen, but nothing happens if I touch the screen, what could be the problem, can I just change the glass on it would that cure the problem, please comment what is best to do.