I'm not sure about connecting directly from a card (I use a 3rd party device.) But if it's in black & white it sounds to me like the format is wrong; ie: ntsc instead of pal or vice versa. But I could be wrong.

What do you mean you downlded nvidia. Do you mean an update to your drivers? You would only upgrade your drivers if you have an nvidia graphics card. So what type of graphics card do you have & how are ou trying to connect to the tv?