All of a sudden no connection

Hi. I use a 12" powerbook on an Airport Express everyday. It works fine. Today, I opened up the computer and there is full strength, but I cannot connect to the internet. No pages come up, e-mail won't connect, etc. If i take it down to another connection, it works great. Other computers work fine on the Base Station, except my laptop. So, bottom line:
My computer all of a sudden stopped working with the base station, despite reading full signal and being able to view it in Airport Admin Utility.
It works with other networks.
Other machines work with the base station, as well as other networks (as they should).
Anyone have any input? Any would be very much appreciated.
Thanks

How would I go about releasing and renewing the IP? I
tried using the same settings as this laptop I'm
using, but that obviously doesn't work.
System Preferences > Network > Airport > TCP/IP
Change from DHCP to Manual, click Apply.
Wait
Change from Manual to DHCP, click Apply.
Wait.
iFelix

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