I have found the solution to this......
1) Ensure that a cartridge is not inserted 2) Hold down the Hint button while turning the unit on 3) When the LEAPSTER menu screen appears, press the A button 4) Touch each of the crosshairs that appear with the stylus 5) Restart unit

Thanks to all

You need to do pen calibration....call leapfrog and they will tell u how to do it and it should work