How can I tell if my airport card is working?

My slot loading imac has had an airport card functioning well for years. Currently is it on a wireless network via Airport Express shared with an airport connected ibook.
The ibook is connecting easily to the network. For two days the imac will not connect. When I go to the System Profiler on the imac , the airport card is recognized with Type, Locale, and Firmware Version, but the "current wireless network:" is listed as "wireless network is not available."
The Ibook's "current wireless network:" lists the correct name of my wireless network. Proximity is not the issue, I have the two computers sitting side by side.
I suspect this mean the wireless card is not functioning. I suppose it could also be a problem with the Imac's antenna. Are there other possible hardware or software problems? How would I troubleshoot the differences before buying a new airport card fot the Imac?
I am running 0S X 10.3.3 on both of the computers.
slot loading imac (tangerine) Mac OS X (10.3.3)

Is the iMac connected to the wireless network? In
your menu bar, are the signal lines grayed out or are
they black. Click on your airport icon as make sure
you have you network selected.
Give that a try.
P.S. I would recommend updating to 10.3.9 as well.
The wireless signal is grayed out.
What do I get additionally with 10.3.9? What harware do I need to manage 10.3.9 on this older Imac?

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