Airport not connecting to the internet

Hi guys, i am having trouble with my wireless internet connection. I have been using the same router for over a year and all has been fine. The router itself seems to be ok and the airport is picking up a full signal, however i cannot connect to the internet. I have found that my IP address is different to that of the router (two numbers shorter and one different). Could this be the source of the problem and if so, how would i go about sorting it?
Any input would be greatly appreciated........ thanks.

grrrrr...
I am having the same problem... At first light was green, great wifi connection but unable to connect to the internet. I've played so much with it, changing DNS, pulling back to previous FW and now just a blinking amber light.
My comcast connection works fine if I manually connect the Ethernet to my laptop. But my macpro is up stairs with a wifi connection!
I thought maybe it was the installation of Parallels, but i've upgraded to tge new version and still the same problem?
Even though I set the connection to DHCP the IP address seems to stay the same 169.254.255.1? Is that right? I did renew but no change.

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