IMac G3 w/Airport not recognizing my Express Network

Seeking assistance,
Have a G5 and a G3 accessing the Internet via an Express Base Station. Was working great to this afternoon. After hours of troubleshooting, including 2 hrs on the support line, still no joy. As outlined above, it worked fine for awhile, the G5 has no problem automatically connecting to the network. The G3 though wont even see it. I am running Airport Express 4.2 on both machines with OS 10.4.2 on both as well. Firmware on the Base Station is 6.2.
Is this an AE problem on the Airport Card in the G3. Checked the connection 3 times and it looks fine. Never mind that it was working?
ISP says everything looks fine from their end as well....
Stumped.....

Sofia,
I wouldn't take that airport card back just yet. You are definitely not the only one with this problem. I have two iBook G3's that are also doing the same thing, except I am connecting through a netgear router, but this has worked before. Just out of curiosity, when you turn the airport card on sometimes, or when the computer boots up, does the computer seem to lock up, or slow down? If this does happen, if you open a terminal and type "top" it should list the process "SystemUISe" as using almost 100% of the CPU cycles.
I've attempted to kill the process by doing a "sudo kill PID", but that hadn't worked either. I'm at a loss. The airport card, when I do successfully get it turned on (success seems very random), I still am unable to connect, even when I turn off all security settings on my AP.
I know it's not the hardware because I'm also running Gentoo Linux on my iBook and the card works great!
I really wish someone would help us out, we can't be the only people with this problem.

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