[rhn-users] RH9 won'd recognize network adapter

[RedHat <RedHat eha no-ip org>]

i installed rh9 on a system that has onboard ethernet, and everything worked out-of-the-box, no problem. my second system has a PCI network adapter, but the installation does not recognize the card. It's a Realtek RTL8139 fast ethernet card, which RH's web site says is certified hardware. Everything else about my installation appears good, but what can I do to make rh recognize that there's a network adapter in one of the PCI slots? Network configuration lists no devices at all.