Classpad 300 Plus "screen Center"

my sister bought this calculator 2 or 3 years ago....

and recently when we toutch on the screen with the pen... we toutch in a point and the calculator assume a point up or down....

i already reset the calculator, and center the screen on the the crosses....

but she still not giving the right points when we toutch on the screen with the pen....


anyone knows what can i do?

(sorry for my bad english)

cump's

Hi, go to system and then clic the boton whit 4 kittke crosses (before the version bottom). It that dos not work I dont knpw what to do...