Unable to connect to Internet after Secruity Upgrade - Any Suggestions?

Like several of the previous posts I am unable to connect to the internet. The affected computer is a G3 iMac. It is connected to a Linksys wireless access point. The Linksys wireless router is connected to my cable modem. I get a message that the Built-in Ethernet is active but: Built-in Ethernet has a self assigned IP address and you may not be able to connect to the internet. No combination of changes to the settings has had any effect. I also have tried all of the fixes in the previous posts. None of them have worked. I am not experiencing any connectivity problems with my other computers (2 PCs and 1 Macbook). Everything worked fine until that danged "security upgrade"!
Mac and PC Mac OS X (10.3.9) Win XP Pro

Visit http://www.macfixit.com/ where the have been
running articles on how to solve problems arising
from the security update.
Thank you for the link to MacFixIt. I found what I needed to correct the problem, although all of the fixes referenced computers with the AirPort card and software. I found that removing the extensions AppleAirPort2.kext and AppleAirPortFW.kext solved the problem. Everything seems to be working properly after a restart last night and an overnight shutdown.

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http://cl.ly/BCUt

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Jinkies.

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GOT MINE FIXED -
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cant connect to internet after ios6 update

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Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
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http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
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http://www.youtube.com/watch?v=XsWS4ha-dn0
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~~~~~~~~~~~~~~~~~~~~~~~
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iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
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http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
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http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
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https://discussions.apple.com/thread/4010130
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~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
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My IT / network literacy - experienced
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Unable to connect to Internet after Secruity Upgrade - Any Suggestions?

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