I'm running Ubuntu 9.04 on a Dell Inspiron 9200. The other day my buddy was watching a movie and decided to plug some speakers in the side.. ever since then, sound only works if I have headphones or speakers plugged in.

lspci tells me my audio controller is this:

00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)

Another fishy thing... I have 9.10 installed on a separate partition. If I boot into 9.10, I find that the same thing has happened.. Quite odd. This makes me think it could perhaps be a physical hardware issue if the problem spans multiple versions/partitions...

Any ideas, guys?

Thanks a lot for taking the time to read this,