IMac Core 2 Extreme = No Ethernet?

I've just installed OS X Server 10.4.7 Universal Install on a new Intel Core 2 Extreme iMac 2.8 GHz. The installation goes perfectly, as does the combo update to 10.4.10, as does the Setup Assistant.
And when it's all done, network status reports that the "Ethernet cable is not plugged in" (it is), and the configuration option for Airport has vanished entirely.
Reinstalling OS X client restores the missing functionality.
I bought this system to use a backup server, as I've two licenses. Am I missing something, or have I made a serious mistake.
Some advice would be very welcome.
Thanks,
Bryan

You guys are great… I went to bed at 3:00 am muttering obscenities to the cat, and got up at 9:00 to find answers waiting.
jaydisc, I'm chagrined... guess I've gotten too arrogant to read the directions. But they don't work for me anyhow - my Server universal installer is 10.4.7, and won't install over Client 10.4.10.
So, Adri, I followed your somewhat more diabolical procedure… with some questions and variations.
I assumed by "AppleYukon2.kext" you mean the one inside the Client IONetworkingFamily.kext package, and its associated "AppleYukon2"?
I tried renaming them one at a time, and got instllation errors at login. Repairing permissions tweaked the IONetworkingFamily.kext, but did not correct this problem.
But while Ethernet still lied through its teeth about being unplugged, Airport suddenly appeared. My wireless router just happens to have fried yesterday last night (why do these things always happen all at once?), but as several of my neighbors kindly leave their WiFi unsecured, I partook of their generosity and had the iMac run its updates.
When they were complete, I anxiously restarted, only to discover I was still allegedly "unplugged."
So I repaired permission one mo' time. I'm big on repairing permissions.
And… Voila! <happy dance>
But seriously... You've saved the day, and the week. Thanks very, very much.
Best,
Bryan

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