The AirPort card on my MBP says "Not Configured"

I am traveling overseas and all of the sudden my AirPort card won't function. It says "Not configured" and I have not been able to turn it back on in order to log into WIFI networks. I tried the Network Assistant and it tells me the AirPort is not on but it is also unable to turn it on. Does anyone know how to fix this?
Thanks!
Walter

JustSwitchedToMac wrote:
I am traveling overseas and all of the sudden my AirPort card won't function. It says "Not configured" and I have not been able to turn it back on in order to log into WIFI networks.
Can you see the AirPort card in System Profiler (Apple menu -> About This Mac -> More Info)?
Here are some things to try to reset the connection settings on your Mac:
1) Use the AirPort menu bar item to turn AirPort off, then on again.
2) In the Network panel of System Preferences delete the AirPort item from the left column, then add it back.
3) In the same panel as (2), define a new location and see if you can make that work.
4) In the same panel, select the AirPort connection item, click the "Advanced" button, select the "TCP/IP" tab, then click "Renew DHCP Lease".
5) 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. Before you try these, note all your network settings, because the latter steps will destroy them.

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