samsung plasma screen is green tinted?

I have a 42-inch samsung plasma.
All of sudden, every cable/tv channel has a green tint.(I can still see all the elements–people/background/etc. but everything is just green/white. like b&w …) I know it's not the cable provider and it's also not the cable wire itself.
DVD works just fine.
What can possibly be the problem?
p,s, i spent around 2 hours to adjust the tv with no success…

Suggestion:

did you check the the Tint G/R option? I just got a 50" samsung plasma myself. I like it but the frame rate isn't as smooth as i had seen it in the store. 600 hz subfield. I have HD cable, but it still isn't as smooth, but the picture is fantastic.