i have a HP ze5362ea, i think pretty much built of the same components.
what interests me is if you could set up your modem under Linux, which is an ALi (Conexant chipset) AC-Link modem.
i have found this link to linuxant and experienced with their hsf drivers under my mandrake 9.1 (2.4.21-13) but no success so far, start to give up hope...
if you could set up your modem (is it the same), what drivers did you use in your RH9.