G5 No longer connecting to airport and other computers on network

My G5 dual 2.0 (mid 1994) was connecting to the internet through airport extreme base station until Saturday. I had upgraded it to leopard (archive & Install) then up to 10.5.1 last week and all was good. After bootup today it doesn't see any other computers on the network and it doesn't get email and doesn't access the web. When I check network settings I notice that WPA Personal is selected but not WPA2, so I tried to change that but it didn't seem to change after applying after a restart. Then I checked to see if DHCP setting were configured. This is where things seem odd, I can't renew the DHCP lease like I can on my MacBook Pro (running current version of tiger) that I am typing this with. I tried to make a new airport connection, tried using a different account, checked system profiler (sees card and all), but no connection to email or internet. Is there a firewall configuration that I need to set differently? Also, verified permissions. Is there something else that needs to be done or is there a ugly bug stopping the show?

i had the same problem after installing leopard on my macbook. it would not connect to the internet! i called applecare today and actually got someone who knew how to help me. he said that you have to reset the parameters whatever that means! and this is how you do it:
1 - turn off your computer
2 - turn on computer and immediately hold down these four buttons simultaneously: Option Key, Apple Key, P, R - then when you hear the second "ding" , LET GO OF THE FOUR BUTTONS.
i did it and the macbook is connecting to the internet just fine. i hope this helps!!!!!!!!

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