graphic issue bug (updated still need help)

[Saber]

Hey , i have ati Mobility Radeon graphic card (Graphics Chipset ATI Mobility Radeon HD 5650
) and i was having trouble with the ground not rendering right (lots of black spots) So i tryed to modify the grapics options ingame
and clicked on the first option to turn on shadows.
This caused the game and my screen to crash and the screen gets restored but then the game is a white screen.

result:
now everytime i log in and it starts to load the character the above happens. And i can't change the option anymore without loading the game.

Help!

I've tried to delete java files and reinstall but somehow it remembers the option i ticked on.
Edit: i'v managed to quickly change it when it loads (also pulling the internet cable out at the same time gives me a few extra needed seconds)

However: i still have the bad terrain bug. black spots and overall messy terrain. it's not this because its turned off : OpenGL setting "Triple Buffering"

[MagicManICT]

Have you tried updating or reinstalling drivers? It should always be the first thing you check when you have graphics issues.

[Saber]

Have you tried updating or reinstalling drivers? It should always be the first thing you check when you have graphics issues.

thanks that solved it