Airport card not seeing networks after IP address clash

Hi - I have a wireless network that works fine, just reset it up again and my two mac laptops connect perfectly well to it, as they always did. The reason I set it up again was that my desktop intel mac pro (my main computer) was giving an error message, that another device on my network had the same IP address as my Airport card, and that it therefore couldn't connect to my wireless network (which has been set up so that the various devices are given their own IP addresses automatically in Bridge Mode). I have never seen this before. I repeatedly tried 'renew DHCP lease' in system preferences - it had no effect so I set up the network again from scratch to see if that would help. Still nothing. The mac pro cannot see either of the two Airport Extremes in my network using airport utility and nor will it connect to the new network when I put in the name and password - again, I have tried repeatedly. The Airport icon in system preferences is orange.
The airport card has never reported any problems and Apple hardware test (as well as the programme that came with Applecare) indicates that it's working normally. There are also no hardware problems with the Mac Pro according to the same tests.
Does anyone on this forum know what I can do to connect the Mac Pro to the wireless network? (I don't have the option of trying to use it as the computer that sets up the network, as it's located a long way from the telephone connection, so that is done using Airport Utility via one of the laptops).

Deleting the keychain with Keychain access worked.
I still can't click on options nor see preferred networks, but now the new keychain I made is finally staying around after reboot and auto connecting me to my home network.
Thank you for the help. I did accidentally delete ALL my keychains, but that's just as well as I probably had other clutter in there as well.

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