Yikes, I'm sorry, I was thinking you were trying to use
component cables. What you have is indeed the
composite type, which is the same as RCA type, which is the same as the yellow, red, and white type, so the way you're hooking them up is correct.
I did read somewhere else on the forum that someone had to change something in their display settings, something along the lines of turning on "TV Out". (I know that my iPod video has such a setting.) I would check my iBook right now and find it for you but it's HD died JUST LAST %&*$@! NIGHT. 😟 Anyway, try the display settings. Best of luck!