One computer can use the network while another can't even see it?

Hello helpful people...
I have a MacBook Pro (original release) and my roommate has an iBookG4. I have had a two-airport network system for years and never had a single issue with connectivity. About 2 months ago, my roommate's iBook started having trouble finding not only our network, but any network... now three shipments to Apple later, they have changed the airport card twice, the logic board, the RAM, etc. All other aspects of the computer seem to be working fine now, except that when I click on the airport icon at the top of the screen, it pulls up no networks. On my MacBook (sitting side by side with the iBook), I usually hit about 10 networks in my condo. Naturally, this would mean that there must still be something wrong with the airport card... but wait... it gets better.
When I take the iBook to the Apple Store... it works PERFECTLY. And I feel stupid. What the ****? Do any of you have any clue as to what is going on?
More specifically, if I type in the name of my network so that it can try to join. It keeps telling me that the password is invalid (and trust me... it's the right one). Also, if I EVER get it to connect to the network (it's hit or miss), it will self-assign an IP address and will never hit the internet. All of this is happening as I use my MacBook Pro on the same network and type this. I am so frustrated (as is my roommate).
Any ideas would be much appreciated.

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