I use Airport Express to network 3 iMacs to a DSL modem.  Recently, the network became undiscoverable to one of the iMacs.  Suggestions for a fix?

I use Airport Express to network 3 iMacs to a DSL modem.  The network has become undiscoverable to one of the computers. I have reset the base station to factory settings but this does not help.  The other two computers are unaffected. All 3 computers can access the internet when connected directly to the modem.  I suspect the problem might be the Airport card?  Suggestions?
beaucleo

Thx for the suggestion, although I didn't have to reset the SMC to fix the problem. The problem was the handshake between the security password and the designated network.  The following links gave me info for investigationg the problem.
http://support.apple.com/kb/HT4199
http://www.ehow.com/how_6831952_test-airport-card.html
http://www.youtube.com/watch?v=aXiZn64aZfg
http://www.cnet.com/news/how-to-invoke-and-interpret-the-apple-hardware-tests/
I would recommend these web sites to anyone who is having problems setting up and/or maintaining a wifi system.
I discovered after reading one of the web references that if I disabled nework security the problem went away. This, however, was unacceptable.  Further experimentation showed that the solution to my problem was to change the name of my network while keeping the same password.  I tried only changing my password but that didn't help.  I still don't understand why only 1 of the 3 networked iMacs was affected.
Again, thx for your interest and reply.
beaucleo

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