10.4.8 wireless router password problem

Hi
Like a number of other people I'm struggling with my internet connection since getting the 10.4.8 update. My problem seems to be slightly different though...
basically airport is connecting to my router on start-up but is not connecting to the internet. I keep getting a prompt asking me to enter a password, but when I enter my WPA password, then I get an error saying that airport could not connect to my router. If I delete the system preferences folder, etc. then the message I get back on setting up my network preferences is that the password is invalid. I've reset my router but I still have the same problem. When I reset my router I can connect from my imac to my router but not out to the internet. I've cleared my keychain also but this doesn't seem to help.
Any help would be greatly appreciated - I've been trying to sort this for 2 weeks now and I'm not getting anywhere!

I believe that this Knowledge Base article may address your issue;
Mac OS X 10.4.8: AirPort does not auto-connect to existing networks after restart or wake from sleep

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