Black and white TV display.

I just purchased a Mini-DVI to Video converter for my macbook to make my TV my new monitor (screen accidents suck) and now I've got a Radio Shack GoldSeries S-Video cable running to my Samsung tv. The resolution is fine and everything works great except for the TV showing up in black and white. I've called AppleCare and they're not sure what's wrong. Anybody have some insight on this matter?

I can think of two possibilities:
1) There is a fault in the S-Video cable/adapter
2) Your TV is set to the wrong input setting
S-Video sends the luminence (brightness) and chromanence (colour) separately. Either the chromanence signal is not getting through (option 1 above) or the TV is not using it (option 2). In the UK, most TVs have a SCART connector which can accept composite video, S-Video or RGB video through the same socket - are you using this or something similar? The TV needs to be set to display the correct input connector (SCART) but also the correct signal (e.g., SCART S-Video, SCART RGB etc.). If you just select the default SCART option, it would probably be SCART-composite, which happens to use the same pin as the S-Video luminance signal so you get a black and white picture!
Hope this helps (and that I got the technical details right),
Simon
Edit: in short I think this is an S-Video/composite video issue - either the Mac is sending composite video and the TV is trying to display it as S-Video, or the Mac is sending S-Video and the TV is set to display composite.

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