Dead sound on Deskpro EN?

Hello all...

I recently came into the second of two Compaq Deskpro EN systems. This one
is a Pentium III 866. I almost came home with a whole pallet of them...as
the sellers were tired of looking at them and asked me to make an offer on
the whole pallet.

I didn't, even though I could conceivably use that many.

Anyway...system runs great, but the onboard sound doesn't work at all. I've
got the drivers loaded for the onboard SoundMAX audio and everything looks
good there. Audio is enabled in the BIOS and the internal speaker works
fine. I just can't get any output from any source. Neither the internal
speaker nor a set of known working external speakers will produce any sound.
Since the other Deskpro EN (same box, same board, Celeron 600MHz CPU)
produced sound immediately after loading the drivers, I can only suppose
that the sound circuitry in the PIII box is broken somehow.

For now I've installed an old Soundblaster PCI card...that does produce
sound but I'd really prefer to play the sounds through the system's internal
speaker...it would be two less pieces of clutter to have kicking around.

Oh, and while on the subject...is there any way to specifically identify
these systems so that a person doesn't have to wade through countless
Deskpro EN models on the HP/Compaq website? I sure can't find any specific
model # on either system, and the only sticker on the exterior apart from
the Windows COA is an overview of the system hardware.

William