Need Help some WPA2 problems with only certain Macs

I've done some searching on the various forums here but can't quite find something that fits the issues I'm having.
We've got 4 Macs on a home wireless network. The specific models are:
iMac 20" Core2Duo
12" PB 1.33Ghz
12" iBook 1.2Ghz
Mac Mini G4 1.42 Ghz
We use to run WPA on a D-Link router (DI-624) and everyone could connect just fine. Then with 10.4.8 all of the sudden my iMac started to have major issues connecting to the wireless network. I did a bunch of reading and found most people saying it was related to using WPA instead of WPA2.
So I went ahead and updated my firmware on the router (it now handles WPA2) and am in the process of getting all the computer back online. I've changed both the network name and the passphrase (and am using WPA2 Personal with AES) and have then set up the new network name along with WPA2 Personal and the correct passhphrase as a Preferred Network on all the machines.
However...
Only the iMac connects to the new WPA2 network.
Both laptops and the Mini have an AirPort Extreme card with firmware version 405.1 (3.90.34.0.p18).
What gives? From what I've read these airport extreme cards should be able to work with WPA2. Oh and all the machines are running 10.4.9.

No help, but i agree with skullcracker!!! Return it ASAP!! You will thank us for this vital information!!!Message Edited by HaZe303 on 05-4-2006 06:29 AM

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