My Blackberry Curve keyboard is not working!?

[Kayley]

Ok so I have a Sprint Blackberry Curve 8330 and friday around 12:30 I was texting on it. About 1ish I went to check it and the screen wouldn't light up, So I thought it was just died. Then later that day I plugged in the charger and the screen lite up, So i had miss messages so i tried checking them but none of the keys worked. The only thing that did was the scrolling ball, but it wouldn't click on anything but now even the scrolling ball wont work..... Ive taken out the battery many time, its fully charged, I did not get it wet, I haven't dropped it ( lately ). I don't know whats wrong! does any one know of a easy fix? I don't really want to go to the Sprint store. I don't have the money to get a new one. please tell me if you know whats wrong and how to fix it.