hi im a newbie here dunno if anyone can help. ive got a 9780 and a 9700. both had broken screens. so i bought new lcd version 002/111. at first the screen went all funny in the 9700. all vertical lines im not sure of the tech term for this. i tried everything to make the screen work. eventually i downgraded the os from 6.0.0 to 5 and it works but if it upgrades back to 6 it wont work. the same happens with the 9780. but ive tried downgrading to every single os download i can find an it will not work. please can someone help me the 9780 is my sons xmas present and i cannot afford to get another screen before xmas. thanks in advance.