CiscoNinja try to open a console (KConsole or something similar to that) and write in this command:
With that you'll open the sound mixer. If the window doesn't appear it'll open to panel. Take a look if you have erverything unmuted.
Next if everything is unmuted then use this command in the console:
A window will appear select the process named artsd and kill it. Try the soundcard again.
If you still don't have no success or if there's no artsd on the list, open control center and edit sound system settings.
If you are testing your soundcard using xmms, you have to select and configure the right driver. To change this settings right-click on xmms and select Options and then Preferences. A window with Audio I/O Options will appear select alsa in the section Output plugin and then click on configure in Audio device, select default or if that's not working try to select hw:0,0 (could be hw:1,0 too, depending on your computer configuration).
I hope this will help!