Airport card not picking up any signals after IP configuration changed

Just had cable internet installed in my apartment, and in the course of setting up the IP configuration for the built-in ethernet connection, my airport card has stopped recognizing wireless networks in my building. Before I changed these settings, the card was working, and there are several networks in the building that it recognized. Now, it recognizes none. The menu appears in the top bar, and I can turn the airport on and off, but it simply is not picking up any signals whatsoever.
I have tried a handful of tactics, including changing the Airport TCP/IP configuration in several different ways, rebooting several times, and even removing and reinserting the Airport card.
For info: I'm using an iBook G3 with OS 10.2.8. (I know, pretty old, but it's still chugging along...)
Any help you can offer would be greatly appreciated!

Not sure. What's strange is that the very same computer was picking up signals (not accessing them b/c they were all password protected), recognizing networks in the area at least, before I played with the other IP configuration settings. Now it picks up none. It shows that there are none in the area, even though I know that there are.
Also, often, when I click on the Airport icon in the menu bar, the computer hangs for up to a minute before the menu actually pops up.
I have an Airport Express unit that I have hooked up to the cable modem, and my Airport card won't even recognize that signal. I'm just not sure what I changed that made it go haywire. I've been using this computer on wireless networks for the entire time I've owned it. Never had this problem before yesterday.
Thanks for any additional suggestions anyone can offer.

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Alright heres the deal. I just bought my first MAC, a Mac Pro With 2 2.66 Xeon processors, yes this thing should fly the space shuttle(you'd think). But why does Apple not have a preinstalled Airport Card in their top of line unit? Who knows. Anyway, I went to the Apple store and purchased one and installed it, no problem. It should work, right? WRONG. My nightmare has started. The computer definitely reads that the card is there. ID and all. But I am not seeing and IP address in the dialog box/tab TCP??. I have called Apple Care to no avail, folks at the store, don't have a clue, so i thought i'd give this forum one more shot at the hopes that someone here will know how to configure this thing and get me on line. NAturally i am writing this from my trusty ol' PC...which never fails me, btw. FYI, the other two computers in my houselhold, this trusty Sony Viao and an iMAC laptop, have no problem at all picking up network signals. And folks come over all the time with their MAC laptops and never have a problem accessing our network..so why can't my MAC PRO? Is there a driver to install, and if so why did it not come in the box with the Card? Someone please help me out before i take this thing back and get a PC. I am on the verge. Thanks.
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To setup AirPort for High-Speed Cable Internet connectivity:
System Preferences > Network > Show > Network Port Configurations
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- Verify that AirPort is "On" (checked)
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Proxies tab
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anyone else see that??
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Airport card not picking up any signals after IP configuration changed

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