Mac mini can't connect to wireless network

I have a wireless network and 3 macs (ibook, macbookpro and mini). My ibook and macbookpro can connect to the network no problem. However the macmini (2010, extreme card) sees the network but connection fails. So I assume (?) the card is OK since the network is detected.
Any ideas?
Thanks

Was your Mac Mini ever able to access your wireless network or did it just stop working recently?
I have been using ethernet since it was purchased. Only recently decided to test the wireless.
Can it see other networks as well? If so, are any of them available to you to let your Mini connect to?
There is only one available
Using the System Profiler on the Mini, please provide the following AirPort information:
Under Network > AirPort > Interfaces:
Card Type
Supported PHY Modes
Card Type: Airport Extreme (0x14E4, 0x93)
Supported PHY Modes 802.11 a/b/g/n
Under Current Network Information for your wireless network:
PHY Mode
Channel
Network Type
Security
Signal / Noise
Transmit Rate
Where do I find this?

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http://www.meritline.com/usb-wifi-wireless-lan-internet-adapter-card---p-79469.a spx?source=fghdac&gclid=CKPZ_tmalLcCFUFV4Aod_h4AZg
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~~~~~~~~~~~~~~~
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The dollar sign is called a "hex escape".
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If BD's suggestion does not work............
In the Library/Preferences/SystemConfiguration/ folder delete the following:
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You will have to re-configure all your network settings since deleting"
===============================
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In the next window that pops up, click the Diagnostic button & do the necessary.
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!http://i50.tinypic.com/izvwo1.gif!

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