Unexplained, my home screen is zoomed in so that I cannot enter my password to unlock the phone. All I can see is two of the four password boxes in the lower part of the home screen, the rest is wallpaper. Keyboard is not visible. Can't reduce the image (using two fingers to shrink the screen image doesn;t work - no response at all), cannot move the image up or down, although it jiggles a tiny bit right/left. Tried to turn off an on, tried home plus sleep/awake. On boot up, the homescreen lights up momentarily at normal size then appears to zoom in and holds there. Any thoughts?