IMac Won't Recognize Airport Extreme

I purchased an Airport Extreme from the local Apple store and set it up according to directions, but my iMac doesn't see it.
I believe that there is a problem with my Airport card inside my Mac.
What I have tried to fix this:
First thing I did was get the latest version of Airport Utility. (I now have 5.5.2)
Next I plugged the ethernet cable directly from my Airport Extreme into my iMac.
Airport Utility immediately recognized the base station and I was able to configure it with a device ID and password.
After plugging the base station back into my DSL router, Airport Utility still couldn't find it. (The Extreme is about two feet from the computer with a clear line of sight.)
Both my iPad and iPhone "see" the Airport Extreme and are accessing the internet perfectly using it.
My next attempt to fix things was to reload OS X into my iMac. This and the updates took a couple of hours, but I got the same results.
I'm pretty sure there is an actual WiFi card in my computer. This is what my System Profiler says under Airport:
Software Versions:
Menu Extra: 6.2.1 (621.1)
configd plug-in: 6.2.3 (623.2)
System Profiler: 6.0 (600.9)
Network Preference: 6.2.1 (621.1)
AirPort Utility: 5.5.2 (552.11)
IO80211 Family: 3.1.2 (312)
Interfaces:
en1:
Card Type: AirPort Extreme (0x168C, 0x8F)
Firmware Version: Atheros 9280: 2.1.14.5
Locale: FCC
Country Code:
Supported PHY Modes: 802.11 a/b/g/n
Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 149, 153, 157, 161, 165
Wake On Wireless: Supported
Status: Network Service Inactive
I'm thinking it's either a faulty card, or a disconnected antenna.
I'm stumped, and I guess I'll just have to take the computer to the Apple Store and have them ship it off to be opened up.
Thanks in advance for any suggestions.

JacoColtrane wrote:
Next I plugged the ethernet cable directly from my Airport Extreme into my iMac.
Airport Utility immediately recognized the base station and I was able to configure it with a device ID and password.
After plugging the base station back into my DSL router, Airport Utility still couldn't find it.
In the future if you have to use an Ethernet cable to configure your AirPort Extreme, it would be better to use a second cable to connect your Mac to one of the Extreme's LAN ports. Then the configuration could be completed using the final connections.
It might help to reset the connection settings on your Mac using these steps one at a time until it works again:
1) Use the AirPort menu bar item to turn AirPort off, then on again.
2) Try to select your Wi-Fi network from the AirPort menu.
3) In the Network panel of System Preferences delete the AirPort item from the left column, then add it back.
4) In the same panel as (2), define a new location and see if you can make that work.
5) In the same panel, select the AirPort connection item, click the "Advanced" button, select the "TCP/IP" tab, then click "Renew DHCP Lease".
6) In the folder /Library/Preferences ( not <yourhomefolder>/Library/Preferences), move the folder SystemConfiguration onto the Desktop, then restart your computer. See if you can now make your AirPort connection work.
They may not help, but they'll only take a couple of minutes to try.

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