Limit to the # of computers the Airport Extreme network can handle?

My wireless network was working fine with the two computers that were using it: my iBook G4 and my iMac G5, both running Leopard. When my wife brought home her new MacBook from work (running Snow Leopard) I could not access the internet. It picked up the wireless network, but it wouldn't connect. Now, for some reason, her computer and my ibook work, but the iMac won't connect. I can't believe that the Airport Extreme could only tolerate two devices, but since I have no idea how to address networking problems this is the conclusion I am left with.
Any suggestions?

If I remember correctly, all I did was reset the Airport to the factory settings. (I think this is right; I was trying to change settings and reset stuff that I am not sure the order or the exact settings that I changed. I can say that since I don't know very much about computers the extent of my fixing was limited to resetting the Airport and re-making a new network (sometimes with and new name and password). That is really all I can think that I did. For some reason the Macbook and the iMac were able to get on. Then (and I am not exaggerating here) the Macbook simply would not pick up the connection.
All of the computers do get full bars, but only the iMac gets internet. For every computer that does not work, the network settings (when I go to network diagnostics) show green lights for: airport, airport settings, network settings and isp. There are yellow or red lights for: internet and server.
Not sure if this helps at all, since I am so imprecise about what I actually did.
An aside question is: which port should I be plugging the cord into from the dsl modem? the wan or the lan? I thought it was the wan port, but the Internet only works when I use the lan (even though the computer will always tell me that there is a problem because nothing is plugged into the wan port).

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