Or you can use your sound cards front interface (if you have it) to connect the audio jacks from there to the TV, or do what S.I.N. said. I had the same problem about the audio, up until I read S.I.N.'s post. I do
have one of those audio jacks, I use it with my iPod
You could use the standard RCA jacks from your sound cards front interface thing, you could use an 3.5mm male/male jack from your PC to the TV, you could just plug your PC speakers into your computer, you could get one of those RCA/3.5mm jacks (which I have, too, lol) and run it from your PC to the TV, or you could just use plain old headphones. There are various ways.
RCA to 3.5mm
3.5mm to 3.5mm male/male