oh damn
ok post that part of /var/log/messages where you have no sound....to
http://paste.debian.net/
then do it to a new paste for when you have sound...and post the links please.
I can then run xxdiff on them and see if I can see anything of value...Please name which link is the bad and the good.
ps I have removed my wiki link previously mentioned for political reasons nothing to do with you.
regards