I have a nvidia video card it's a (6600,LE,AGP8X,256MB) with DVI&TVOUT?

i have it hooked up to my tv with an S-video cable from my computer to an RF then from the RF to my tv but i cant get a picture on my tv i have searched for my tv and i have forced picture to my tv but still no picture im not sure what ive done wrong or if there is a setting i need to change HELP PLZ|||http://forums.afterdawn.com/thread_view.…