Can't See Wifi Network At All w/ iBook..No Prob w/ Windows

The computer in question is a 12" iBook 1.33GHz model. There are several computers connected to a 3rd party router, and the iBook is the only computer not seeing the wireless network at all. Everything worked fine up until 4 days ago. No changes were made. Is the a firmware update or anything I need to do my my Airport card?
Everything has been reset with still no luck.
What else can I do?

This is actually for a friend, but she has not been around another wireless area. We can see the Airport Card in the system profiler. The firmware version is 404.2(3.90.34.0.P16).

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