Airport only works on certain computers...

I have two APX and two AX. Even if I use just one APX still only my 15in powerbook will have inernet. My other computers (G4 Cube, and two older iBooks) will recognize my network, but in the network status pane in system preferences it registers yellow (may not be able to connect to the internet). Where as on my powerbook it is green.
I am pretty savy with the network and have rebooted and reset the entire thing many of times. What is the problem?

One suggestion could be that somehow the mode has changed from 802.11b/g to just 802.11g. This would stop the older machines using the network, although I do believe that they may still see it.
Applications > Utilities > Airport Admin Utility > Airport Tab > Mode (At the bottom)
Make sure that the mode is set to 802.11 b/g compatible.
Will
1GHz G4, 15" PowerBook, Airport Network, 1G iPod Mini   Mac OS X (10.4.6)   >>Updated iWeb Hints n Tips<<</a>

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