Second monitor weird colors unbuntu
 

Hi guys,
My name is Reza & i am a newbie to linux,installed ubuntu just yesterday,
at first with a single boot system(ubuntu) everything were fine with everything include second monitor ,then i installed vista too,now i have a dual boot system & i am very happy to get rid of crappy junk microsoft's software as much as i can,unbuntu performance is really wonderful to me,just i have one problem,my second monitor show very weird colors ,almost like a negative print,then i boot with vista & there everything are fine with my second monitor,then i guess i don't have any hardware or driver problem,any help or suggestion?
I changed my visual setting from extra to non,in case if this problem is because of not enough memory or els,but iy didn't work.
my loptop is a vaio vgn,4 gb ram,intel centrino 2- 2.66 ghz-ati radeon graphic card.
I appreciate your help.

Sorry, can't help with your problem, but wanted to quickly say that if your username is your real email address, you should probably change it immediately or risk getting an insane amount of spam.

Evo2.

Thanx a lot for the tip,i couldn't find any option to change my user name, i try to delete this account & create new one now.