Do you get sound when you log in as root? if so it may be permissions this is a common problem on some distros.
Login to the desktop of your choice as root and try to play an MP3 if that works then you may need to add yourself to the audio group.
adduser yourname audio
to verify
groups yourname
you should see something like this..
[10/09/04][greg@otis:~]$ groups greg
greg : greg disk lp cdrom audio src video users
if that doesn't work then
cd /dev
ls -l dsp*
you should see that all things dsp are owned by root and group is audio.
something like this...
crw-rw---- 1 root audio 14, 3 Jun 30 12:17 /dev/dsp
crw-rw---- 1 root audio 14, 19 Jun 30 12:17 /dev/dsp1
crw-rw---- 1 root audio 14, 35 Jun 30 12:17 /dev/dsp2
crw-rw---- 1 root audio 14, 51 Jun 30 12:17 /dev/dsp3
if not then do this
chgrp audio dsp*
chmod 660 dsp*
that should do it assuming it's a permissions issue
Good luck and don't leave us hanging. It's nice to see resolved issues.
[Edited by egorgry on 2004-10-09 11:12:14]