How to wipe Internet settings clean

Some time back I hooked ethernet (Roadrunner) to my Powerbook. Ever since I am unable to get into my own network over airport. I keep getting that my machine has a self assigned IP address and I can't get Internet. I have tried all the hints here in the forums and nothing works. I even dropped into the terminal using ipconfig and checked en0 for the ipaddress.
How can I wipe the settings on this powerbook and gain wireless access to the Internet again? The funny thing is I can jump on my neighbors network and surf all day with no problem, yet I can't get into my own Internet. I have security on WEP and can get access to the router, but it isn't assigning me a new ip no matter what I do.
I have tried Dlink 524 and the New Belkin G+ routers and all to the save avail... NO internet, yet I can log into the network.
I have reset the Earthlink Cable modem, reset the router, changed routers, created a new user and it is all the same.
Anyone know how to fix this?
I am stumped.
Thanks in advance.
G5 DP 2.0, 20" FPw, Raptor boot drv. & Seagate 160   Mac OS X (10.4.6)   S/E W600i

I'd try a few things...
first off.... turn off computer, router, modem, etc.
then unplug the AC power from the cable modem AND unscrew the coax cable from it. Let sit for like 10 minutes.
Then screw coax cable back into box, plug in AC, reconnect to router, and plug in router, etc.
When your mac starts up, test and see if it works.
If not.... then go to Sytem Preferences/Network
then click on SHOW and select Network Port Configurations.
Then DELETE your aiport or wireless settings, etc.
Under the LOCATION tab, do the same...and delete locations...
Then click apply now...restart computer.
then go back to System Preferences/Network.
go to SHOW and select NETWORK STATUS
you may see an option for your internet connection with either a green dot or red dot next to it. Red dot usually means there's no internet connection.
Double click on it.
It will take you to the TCP/IP/PPPoE/AppleTalk/Proxies/Ethernet settings. If your internet setup is by using a DHCP, click on RENEW DHCP Release button a couple times (waiting a few seconds in between each clicking).
Then apply now, once you setup your settings, etc..... Then restart.
Upon restart, check your router settings. Your router may have simply wigged out....may just need to be reset... check your DHCP or IP settings on the router and make sure that WEP passwords are correct etc.
I can't think of anything more. I hope this helps.

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