It depends on what sound-card you have. If you have a SoundBlaster live, it
is the green one. If you have some other card, try each one, it will not
harm anything, you just won't get sound from the wrong one. You may need to
switch your sound card settings to headphones, it all depends on your card.
If you have no luck, re-post and let us know which sound card you have.
LOL, JAX