Im not sure which it is,or if its either of them,but when i try go scroll down the page with the keyboard using the arrow keys it scrolls down each line insted of just scrolling the bar at the side.When i press the Page Up/Down button it doesnt go down a set amount it just goes straight to the bottom/top or doesnt move atall.Its been like this for a while and EXTREMELY anoying, any help would be great,Thanks.