Airport does not have IP address and Self assigned IP address

Using a 2.66GHz Mac Pro with OS X.6.6 and a Netgear DNG200 wireless and installed Airport Extreme Card and WPA2 security.
In Network click on Airport and 'Turn on Airport' Up comes the message 'Airport dos not have IP address and is unable to connect to the internet'.
Go into advanced and double click 'Network Name'. Supply password even though remember is selected, and message changes to "Airport has Self Assigned IP address 169.254.etc.etc and will not be able to connect to the internet'.
After repeated back to Network Name and double clicking and supplying password eventually connects. Simple to reconnect by selecting Turn Airport On in Menu Bar so long as the machine is not turned off.
Any suggestions please?
Message was edited by: harryb

Hi,
http://osxdaily.com/2009/12/22/mac-wireless-problems-guide-to-troubleshooting-ai rport-wireless-problems-on-your-mac/
Hope it helps.
Cheers.

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Airport does not have IP address and Self assigned IP address

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