12-01-2014, 07:09 AM
'Might not be a busted/yanked antenna cable... But the symptom very much resembles it. The device shows up in the System Information (Profiler) panel, but no WiFi networks show up...
How's your laptop's WiFi reception near the iMac?
'Sure you're not using a hidden SSID on the WiFi network?
Got an alternate boot drive to start up from? (Not a clone as that would inherit the problems from the old system.) Maybe start your laptop (MacBook Pro?) in target mode and see if you can boot the iMac from it, just to see whether WiFi networks start showing up in the Airport menu under the other OS.
How's your laptop's WiFi reception near the iMac?
'Sure you're not using a hidden SSID on the WiFi network?
Got an alternate boot drive to start up from? (Not a clone as that would inherit the problems from the old system.) Maybe start your laptop (MacBook Pro?) in target mode and see if you can boot the iMac from it, just to see whether WiFi networks start showing up in the Airport menu under the other OS.