Is it an integrated sound chip or a separate one? That's probably a big deal - if it's the first, you're pretty much fucked without a warranty, if it's the other one, you could just exchange it. If there's room for a separate sound chip anyways, you could get that and override the integrated one, but since it's a laptop, room probably isn't a thing you'll see.
I'm hoping that you've updated the drivers already. That's always the first thing you should be looking at for problems.