Did you try putting another pci nic into the machine and rebooting it? That's what finally woke kudzu up in mine. Also, you can use webmin to uninstall the 2.4.20-9 kernel and kernel header. It's a great swiss army knife for just about everything in the system and it's free. get it from www.webmin.com
it has an update tool built into itself so you can keep it up to date easily. It works great for package management.
Hope this helps;