My Powerbook no longer connects to my wireless network

Hi.
Recently bought a new iMac 2.4GHz and reconfigured my Airport Express. Network works fine (set as B/G compatible) with the iMac (N extreme), but my old Powerbook G4 667MHz running 10.4.11 has stopped working (old B Airport card). Tried all sorts of changes including different types of password encryption, resetting the network and updating the software - all without joy. On startup, the Powerbook recognizes the network I have established, and asks for WEP password. It then refuses to join the network giving a standard error message recommending out of range, wrong password, etc. All obvious settings are correct as I have tried them about 20+ times now with no joy.
Tried another wireless network away from home, and get the same result so suspect a fault with the AIrport card in the Powerbook.
Tried running the Hardware test disc on startup with the Powerbook, but it will not run (ejects CD).
Any other way of running a fault diagnosis on the network, Powerbook or Airport card?
Regards
D

Hi Duane.
Thanks for the suggestion. Tried it, but no success.
Have now spent hours on this, but finally cracked it this morning. As Sherlock Holmes pointed out... when you have eliminated the impossible, all that remains - however improbable - is the truth.
The answer lies in the Keychain Access and the Location/Preferred Network configuration.
I reset the Airport Express base station and reconfigured it using a different network name. Went into Keychain Access on the Powerbook and deleted all the Keychains for the Airport. After this, the Powerbook thought it was joining a new setup and accepted the password first time. JOY!!! This is not the first time I've had problems with the Keychain - must be something to do with the hierarchy of the configuration protocols.
resin888
Perhaps this will work for you too.
Regards
D

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