Can't find airport but all other computers do?

This is very similiar to a previous posting but no one has answered or given a solution.
Louis Jan, "I cannot access the Internet & the base station is working!", 07:31pm Aug 6, 2005 CDT
I have a wireless airport network in my home and I have three Mac's. One is a G4 PowerMac connected directly to the basestation and it works great. A G4 Laptop and is connected wireless and works great all the time. I have a iMac G4 that uses an airport card and it "use" to work all the time and now won't connect to the airport network.
I have reset just about everything and it is set up exactly like my laptop. I can sometimes restart it and get it will work for about 5-10 minutes and then it loses connection or it won't connect right from the start. I have also noticed that when this happens the system starts getting "clunky" and if I move my mouse down to the doc, the icons move slow or kind of clunky as well as opening folders.
The signal is great all the time and it shows everything should be in order but when I open Safari or any browser, I get a "server can not be found" message.
Help. I have reinstalled the system software, permissions, etc. Nothing seems to work.

Your problems are not at all similar to the discussion you quoted. In that discussion, the problem was with the Base Station (despite the choice of discussion title). On the other hand, you have a Base Station that not only works but also has a known working wireless interface, since another Mac can connect to it wirelessly without difficulty.
First thing to try - open up the problematic iMac and (a) pull out and reseat the Airport card as well as (b) pull out and reseat (FULLY) the Airport antenna cable connection to the card.
If this fails to solve the problem, my suspicion would be that you have a marginally defective Airport card inside this iMac. The only way to test it is to substitute it with a known working Airport card.

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