2 powerbooks, 1 APE; one can connect, but the other can't

I have two powerbooks and one Airport Express. One can connect to the APE, but the other can't. There were no problems earlier this evening, but it just stopped for some reason. Under "Internet Connect" it lists Aiport Power as "On", and it has no trouble finding the other computer when I turn on internet sharing, which leads me to believe that the airport card is working fine, but it seems to be a connection problem. Any ideas?
Powerbook G4   Mac OS X (10.4.2)  

Does the PowerBook, having trouble connecting, able to connect to other Wi-Fi networks?
If so, let's double-check your AirPort settings on the problematic device...
System Preferences > Network > Show > Network Port Configurations
- Verify that an AirPort option exists. If it does not, click "New" to create one. - Verify that AirPort is "On" (checked)
- Verify that AirPort is at the top of the list. If it isn't, you can drag it to the top.
Systems Preferences > Network > Show > AirPort
AirPort tab
- By default, join: Automatic
TCP/IP tab
- Configure IPv4: Using DHCP
- Configure IPv6: Automatically or Off
Proxies tab
- Configure Proxies: Manually
- Select a proxy server to configure: <All proxies should be unchecked unless you specifically require a proxy for Internet access.>
- Exclude simple hostnames (unchecked)
- Bypass proxy settings for these Hosts & Domains: <leave blank>
- Use Passive FTP Mode (PASV) (checked)

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