Airport card not auto-connecting after adding WPA on router

Hello;
I recently turned on WPA security on my previoiusly unsecure router (I had been using a MAC filter) and set up a password, etc...
Two laptops connect to this, my iBook G4 (powerPC), and a Sony Vaio. The Vaio remembers the password on reboot, but the iBook keeps forgetting it, as if somewhere it has the old settings still stored away...
Everytime I reboot I have to go into system preferences, network, and do a 'diagnotistics' to get it to find it, and add the password by going through 'closed networks' (otherwise it just tells me it failed to connect and never asks for a password).
Is there some way I can get it to remember the settings across reboots?
Where are the preferences stored so I can remove them and 'start over'?

Deleting the keychain with Keychain access worked.
I still can't click on options nor see preferred networks, but now the new keychain I made is finally staying around after reboot and auto connecting me to my home network.
Thank you for the help. I did accidentally delete ALL my keychains, but that's just as well as I probably had other clutter in there as well.

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