Can't connect to WPA wireless network

Switched from WEP to WPA and now my PowerBook G4 refuses to connect. I'm prompted to type in my WPA Personal password and the little beach ball spins and then tells me:
There was an error joining the AirPort network "Napier 1532 Wireless"
[Try again] [OK]
I'm trying to connect to an AirPort Express. Settings:
Wireless Security: WPA2 Personal
Encryption Type: WPA and WPA2
PowerBook G4 Mac OS X (10.4.10) Airport Card Firmware 9.52

Hello,
I too have had some steps to tread in order to get WPA2, from WEP.
My firmware version is: 405.1, yours reads: 9.52. A bit old for the new WPA.
You do not say if you have the airport express or the airport extreme? In the latter case Apple has updates on their website for it to get the WPA and WPA2. The airport express is more limited, but it works as part of my network with the airport extreme. (The express handles only the printer)
If you have password forgetfullness, you can reset the unit to original spec with the little button on it... you do have to know the original ID, which will be in the original box. I think all of Apple units are the same, so once you have that you can "rebuild" it again with the network assistant, with WPA2 and a Name and password you can remember. Also, make your changes thru the assistant or you may miss an item in the process and hang it up... which is what it sounds like happened. Then all other changes "Should" require your wifi password to bring up the network screen in order to make.
PS: I have got OSX to do things with part info, but I had to have it try 2 or 3 times before it figured out what I wanted it to do (a smart little program all in all). But it works much nicer with all the data it needs, and for a longer time without problems.
Powerbook G4 Mac OS X (10.3.9)

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