Need a little more info. What are you trying to do? Play game over TV with audio over TV?

 This is what I use to go from sound card to stereo CD input. (1/8 Stereo to RCA L/R) Then if you want headphones use the Stereo headphone jack, not computers. Plug Video card into TV and you should be good.

if using win7/vista, you should be able to open the playback devices dialog and set your speakers to default...mebbe...

Well I have not used HDMI yet but hooked up a friends system and the HDMI will transmit audio and video.

You should have a different type of output on your video card that will connect to the TV without audio. My friends TV has a computer monitor input as well as S-Video. The computer monitor cable is probably the better option. Beware there is signal loss if the cables are to long. I think S-Video was 25ft before any loss and different cables can be different lengths before signal loss.

psychoak: I can't find a setting for it in the Radion Catalyst control panel. It's not important enough to do the driver thing. I think I will buy a bigger PC Monitor:) A TV might have more frames in it's video processing pipeline, creating more latency (16.6ms delay per frame). It could be deadly in some games.

myfist0: Your suggestions would not be 1920x1080 resolution.

If you play any FPS's get a good sound card that is 5.1 capable. and then get a nice set of headphones that are 5.1 capable. For gaming good headphones will trumph any large speaker system.