integrated audio problem

["Lei Kong" <leikong@msn.com>]

My system is a dell dimension 8400, my sound card is an integrated one from
soundmax (?). My kernel is 2.6.8-2.

When I do 'lspci',  I got this
0000:00:1e.2 Multimedia audio controller: Intel Corp. 82801FB/FBM/FR/FW/FRW 
(ICH6 Family) AC'97 Audio Controller (rev 03)

When I do 'lsmod', I got:
snd_intel8x0           37548  0
snd_ac97_codec         69764  1 snd_intel8x0
snd_pcm               100356  1 snd_intel8x0
snd_timer              27780  1 snd_pcm
snd_page_alloc         12680  2 snd_intel8x0,snd_pcm
gameport                6016  1 snd_intel8x0
snd_mpu401_uart         9344  1 snd_intel8x0
snd_rawmidi            26532  1 snd_mpu401_uart
snd_seq_device          9224  1 snd_rawmidi
snd                    59364  7 
snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer,snd_mpu401_uart,snd_rawmidi,snd_seq_device

So, everything looks fine, but there is no output at all when I play mp3 or 
cd or anything, what could be the problem? Do I need to compile the kernel 
with
something magic enabled? or I need to download a proprietary driver from 
somewhere?

thanks.