from debian site...
http://www.debian.org/releases/stabl....html#no-sound
5.1.8. Sound stops working
In rare cases, sound might stop working after the upgrade. If this happens, go through the ALSA checklist:
* run alsaconf as root user,
* add your user to the audio group,
* make sure the sound channel levels are up and unmuted (using alsamixer),
* make sure arts and esound are not running,
* make sure no OSS modules are loaded,
* make sure the speakers are actually switched on, and
* check whether the command
Code:
cat /dev/urandom > /dev/audio
or the command
works for root.
after that, you could try to reinstall alsa again