Shoutbox

If you really want to try it, open up your case and follow the wires from the front headphone jack and see what it's attached to. (If your soundcard is nice it might have a little bit of writing on it too)
If you do get another soundcard all you have to do is move these wires, but keep in mind that not all soundcards do support this.
Don't feel scared to take a look though, you won't break the computer.
multimillion2k accepts no responsibility for broken computers. Kidding!! I really should stop saying stuff like that. But seriously, if your computer breaks, I'm not paying for it.. =P