AirPort Express Sees Neighbor's Network But Not Mine!

Hi everyone!
I’m a complete newbie to wireless networking but expected my AE to “just work.” It doesn’t, so far.
I plugged-in my cable ethernet cable and USB printer cable to the AE. I then plugged the AE into the electrical socket. Got a green light.
After multiple attempts and even performing a “factory default reset,” the AirPort Utility scan will NOT recognize the AE. Am I correct in thinking that it should?
In Network in System Preferences, I can connect to my neighbor’s wireless network but when I create a new network, all I get is a green AE light and the note that “AirPort has a self-assigned IP address and may not be able to connect to the Internet.”
So, I have no wireless Internet connection. The cable internet connection (cable ethernet direct to the iMac) is working fine.
I’ve read in other discussions that a problem may exist in using AE and 10.5.6. Yes? No?
Anyway, if some kind soul would help me figure out what’s going on and how to get AirPort Utility to recognize my AE, I would be eternally grateful!
Please advise and don’t hesitate to point out my errors in trying to set up my AE. I need to learn and so do others.
Sincerely,
flyboy01

Welcome to the discussions forum Andy.
After multiple attempts and even performing a “factory default reset,” the AirPort Utility scan will NOT recognize the AE. Am I correct in thinking that it should?
Yes. But you have to select its network in your Airport menulet - after the reset it will appear as "Apple Network xxxxxx" where xxxxxx are the last three bytes of its MAC address. If you're connected to your neighbor's network while running Airport Utility, it won't see your Express.
Assuming you've done this already and AU still doesn't see your Express, read on.
Sometimes cable modems get confused when you connect different devices to it. Reset your cable modem (power it down for a while). Remove the Ethernet cable from your iMac and leave it removed. Perform another "hard reset" of your Express then connect it to the cable modem. Power up the cable modem.
Does Airport Utility see the Express now?
Yes: Answer the setup questions in Airport Utility and you're done.
No: I'd wonder if your cable modem still hasn't been properly reset. Try leaving it powered off for the better part of an hour. While it's cooling look for a reset button and try to find documentation addressing how to reset it. Also, reset your Express again. Couldn't hurt.
Still not working? Gnash teeth for a while and curse the gods of wireless. Then, create a new, temporary user account on your iMac. Log out of your account and log in under the new account. Any changes?
Still not working? Post back because someone will happily point out that both of us missed something obvious.

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