Mac Pro "error joining wireless network", G5 and iBook OK?

Trying to connect to internet via wireless. The airport recognizes my WPA Personal password but still show "Error joining network", the airport bar is full but cannot connect to internet. The Network Panel says:
"Airport is connected to the network. Airport has a self-assigned IP address and may not be able to connect to the internet"
Here's my setup, every firmware is up-to-date:
Mac Pro 2.66Ghz Dual Core Intel Xeon
OSX 10.4.10
Linksys BEFW11S4 V.4 (firmware 1.52.02)
Airport Extreme card (update to 2007-003)
In Network panel:
Airport- Automatic
TCP/IP- Using DHCP
PPPoE- no click
Appletalk- active
Proxies- manually
In Sharing panel:
Firewall- On
Internet Sharing- Off
I am 100% sure that the router is working because we have a G5 (10.4.1) and a iBook (10.4.9) in the house and there's no problem for both devices, both takes the password and connect to the wireless network no problem.
And one thing, when I go to the setup page of the router (192.168.1.1) and disable the WPA password security, the Mac Pro works perfectly. So whats the problem? It doesn't recognize the WPA?
Mac Pro 2.66Ghz Dual Core Intel Xeon Mac OS X (10.4.10)
Mac Pro 2.66Ghz Dual Core Intel Xeon   Mac OS X (10.4.10)  

First question:  Is there a wireless card installed?  It was optional on a 3,1.
Go to System Preferences - Network and see if you have AirPort listed on the left. It also may be turned off which you can fix there.

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