just been looking on google for some answers ... really common problem aparently :/
possible solutions include
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there are 2 things you want to look for, refresh rates and if PAL or NTSC. In the U.S. it should be set to NTSC or NTSC-M and have a refresh rate of 60Hz, in Eourpe you want PAL. This fixed my problem, hope it helps
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Not all S-video cables are color. Many only produce Black and white.
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some tv's are not compatible with pc signal
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but i see you think its only a nvidia prob :/ but i just cant find much related to nvidia card specific problem.
most info i can find relates to NTFS / PAL settings
someone suggested reverse the cable just for the hell of it and it fixed some guy's problem!
someone suggested lowering the refresh rate to below 50Hz
some more
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I actually ran into that problem last night, i'm running an fx 5600 in my
3rd machine that i use to watch movies i've recorded with my tv tuner
card.
i'm using the starstorm 56.72 drivers i believe. the only way i was able
to
fix it was to go into nview tab, click on my tv, device settings, select
tv
format,then advanced settings on the bottom of that menu, in that area i
change the output format from auto detect to s-video. when that setting is
set to auto or to composite video my colors are gone, it's just black and
white, but when i use svideo output my colors are great. btw i am also
using
a svideo to composite video adapter 
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Recently I found a bug in the nvidia forceware 61.55 drivers that are listed as newest on nvidia's website. It seems that this version of forceware affects the TV out function as to make the output black and white instead of color.. I have found it affects my geforce 440's, 5200's, and geforce2 cards. Since my higher cards are ATI, I have no other geforce cards to test on. Those with nvidia cards using TV output may wish to use a older version driver available at www.guru3d.com..
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