My screen dose not work

well , does ur pda ever fall? or get into water?

cause it might cause ur LCD screeen to be broken, but if ur pda ever got into water, ur component inside might be broken.

If one of above occured, u have to bring it to technician,unless you know how to replace a LCD or the other component.

if none of above occured, then u have a software problem, you need to flash it (put a fresh software in it), which you had to bring it to technician too, but it might cost much little than if you had problem on the LCD and component.