I've had an iBook 600 with an airport card since Nov 2001. Yesterday, it stopped receiving airport signals. I have an iMac with an airport card and it receives the signals at full strength, so I can rule out the base station.
I removed the card from my iBook, thinking the wire to the antenna might be loose, but it didn't help. The Apple System Profiler lists the card so I know it's seated okay.
Any ideas?