Help! New iMac won't recognize ethernet cable and can't check it

I just unboxed my new iMac and can't get on the internet (I'm on my powerbook). The problem is this; in Network, it says "The cable for Built-In Ethernet is not plugged in." Only, it is. Can't be the cable b/c that's the cable I'm connected with right now. So, I go through "assist me" and when I click on "Assistant" it takes me to the Intro page where I'm supposed to give a Location Name. I do this, calling it "home." The ver next screen, after clicking "continue" takes me to "How do you connect to the internet?" The problem here is that, of the 5 options, only one is selectable. Airport is the only one that can be selected?? "I use a telephone modem to dial my ISP" as well as "DSL Modem/Cable/Lan" are all greyed out..they cannot be selected. I use an ethernet cable. Why is this not able to be selected? It's very frustrating. I've turned off Airport and Bluetooth, yet I still cannot check any of these. I need to check "I use a cable modem to dial my ISP" but I can't b/c it won't allow me. Can anyone help me here? I can't use my brand new iMac and it's kind of a bummer. I thought these things were plug and play? Thanks.

I went and checked logs. Now, I'm not exactly sure what it means, but this is what it shows in the console.log:
Mac OS X Version 10.4.10 (Build 8R2218)
2007-09-28 08:15:33 _0400
2007-09-28 08:15:34 SytemUIServier [80] lang is:en
Sep 28 08:15:43 cory/System/Lybrary/CoreServices/mcxd.app/Contents/MacOS/mcxd:
MCXD.initializeDirectoryServices: Unabe to get the ethernet address
So, I'm curious about that last line. I'm completely stumped. I'm going to have to call apple care. I plan to speak with my IT guy who installed my SW to see if there's any pref's or something that my agency puts on the agency computers that would maybe be doing this. He said he'd be doing a "build" on my machine so that I had that same software I have at work, so I could work from home. Don't know how that could cancel out my ability to select Ethernet in my Network Port Configurations, but who knows.
I'm just bummed I have a new computer and can't get it up and running.

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