TV-Out only gives blank screen...

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I have an Advent laptop with TV-Out, so I bought an 4 pin S-Video to
RCA cable and connected them up. I've set the second display to
800x600, and put my DVD player channel to AV3 (which is written above
the Video In socket). Then I press Fn-12 to switch and... nothing. The
screen just stays blue. I can get sound to work fine through the red/
white cinchs. I can also connect an old tower with an NVidia card TV-
Out just fine via RCA to RCA, thought I haven't tried S-video to RCA
with it yet.
Any ideas? Can the DVD player take one type TV-Out (RCA) but not
another (S-Video)? I can't find any settings on the DVD player for it.

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