WEP Password Only Works on 2 out of 3 Computers

I'm having trouble with one of three computers connecting wirelessly to the internet.
The three computers are MacBookAir, iPad and PowerBook G4.  The first two connect fine.  The PB does not.
The router is a plain vanilla Linksys WRT54G.  I have it set for WEP Password protection.  The wireless network name appears on all three computers.  I have entered the 10-digit password on each.  The PB keeps returning the not-very-helpful "There was an error" when trying to connect.
I tried trashing network and internet config prefs.  When running the network assistant on this PB, it says the password is incorrect. 
I have checked the password multiple times, and it is correct.  I have typed it again, and the same error occurs.
I also checked the MBA to see if I could see the password, but for whatever reason the "show password" box is grayed out.  I have retyped the correct password, however, and connectivity is still good.  I have no idea how to review the password on the iPad; I just typed it in and it works.  There are no network diagnostic tools available that I can find or any visible place where the number may be verified.
I have turned off and turned on airport.  I have deleted all network choices in the airport networking settings, shut down and restarted with the same result.  (Airport Status in the network pane has a red dot and says, "Airport is turned on but not connected to a network."
I'm out of ideas.  Does anyone have a suggestion?
The PB is a 1.5G G4 running 10.4.11

First, why use WEP? It's next to useless as an encryption techology which can be broken in less than 15 minutes with commonly available tools on the internet. Use WPA or WPA2 Personal.  All 3 of your systems support both of those.
That aside, did you try using the Powerbook and WRT54G with no encryption, as a starting point? If that doesn't work, then there's a different non-encryption-related issue. If that works, try WPA or WPA2 Personal. 

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