tamtam fwiw you really should post a link to your dell support page, hence people can see what sound card you have, etc.
you could require OSS device which needs a modprobe or something.
I'm sure the wealth of knowledge of the people on these forums can get you up and running
to play it safe your probably better off using slackware's 2.4.31 or 2.6.13 kernel as none of us know what you did in your kernel
that will rule out any possiblity that you may have done something wrong on your side