mini 2440 t0uch screen problem

Uttamkr
Hi! everybody
           I have a mini 2440 with 3.5 inch touch screen. When i power on
the board, it is working fine. But the screen shows only vertical lines.
I don't know what the problem is? Is the touch screen got damaged. Please
help me out. I am using the same OS that comes with ARM board. 
            Thanks