HELP - moved iMac to college - airport can't "see" wireless network

I am a relatively new mac user and therefore, pretty clueless as to what's wrong/how to fix it.
At home, it picked up our secure network right away.
I moved it to college (University of Maryland) and the airport can't pick up ANYTHING, but my windows laptop picked up the network right away.
No clue what the problem is....any insights would be HUGELY appreciated.
Wireless card type: AirPort Extreme
Firmware version: 405.1 (3.90.34.0.p18)

Hello Madimad!
I assume you have tried the basics:
1. Click on Airport Icon and make sure it's actually ON
2. Click on Airport Icon and Click on Other > see if the network you are trying to connect with is listed, if not try typing it in...
You can also go to System Prefs > Network > Location: Automatic and Show: Network Status... let us know what it says
Good luck, Rick

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http://discussions.apple.com/message.jspa?messageID=3366662#3366662
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Message was edited by: myhighway

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I have scanned many posts on this topic but have not seen my specific problem resolved, so I'm starting a new post. Here's all the facts and things I've checked.
Hardware Details
iMac 1.25 GHz G4
Airport Extreme card (shows up in system profiler)
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WPA Personal
Have never had a problem using this network. 2 PC's an 2 Macs regularly connect. Right now one PC and my wife's MacBook Pro are using the network.
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