that's weird...you put back the original dispdriver and it didn't work?Are you sure you put w200 dispdriver?Try flashing your hole firmware,maybe this will help...or try putting original layout no matter what you did.I had the same problem problem with w810,the screen was blue,i put the layout again (please notice i hadn't done anything with layout)...If this doesn't help,I can't help you neither...But it is so weird...That's the first time i hear it...