MiniDVI-Video Adapter Problem

I'm having problems with a new DVI-Video adapter that I got from Apple.

I've plugged my iMac to my TV, using an RCA Composite cable, but all I get is a black screen. I've changed all the options, from mirroring, to color, to resolution, and still don't get anything.

Any tips?
NickD

Never mind. I fixed the problem with an S-Video cable. Thanks for looking though!

-NickD-