Imate K JAM flex cable problem

Hello,
Hi
My I mate kjam shows white screen with lines at all times when connected with the new flex cable brought from E-bay; as my old flex cable was damaged. When taken a magnet close to the flex cable key pad, it shows flickering screen with distorted information.
The flex cable i brought is new and i am sure that my PCB is funtioning properly as i have checked it.
PLEASE HELP ME ...