You can find general instructions for setting up your sound card here:
http://www.daemonforums.org/showthread.php?t=16
The second post has a script which detects your sound card, save it to your hard drive and run it as root.
If that doesn't work, please post the output from the following commands to provide more information about your system:
Code:
# dmesg
# pciconf -lv
As a sidenote, also make sure the volume is turned up. I don't know how the GUI KDE thing works, but from the commandline you can control it with
mixer(8).