Airport express cannot be detected in one of my Macs

Both our macbooks are connected to our network but my imac cannot detect the airport express. The imac can detect the network I am trying to join but I cannot connect to it. I open airport utility but it cannot find the airport express. What should I do? Thanks for your help

socdoc wrote:
The imac can detect the network I am trying to join but I cannot connect to it.
You might try resetting your connection settings using the steps listed in this message:
http://discussions.apple.com/thread.jspa?messageID=10695921&start=1
They're not guaranteed to solve the problem, but they'll only take a minute or so to try.

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