ci sono parecchi topic sull'argomento. li hai letti?
elimina il network dai preferiti, elimina anche le due voci airport nei portachiavi (accesso portachiavi), spegni ipv6 nel TCP/IP in pref. sistema/network e poi riaggiungi il network. aggiorna il firmware della periferica, cambia canale e cambia pass, passando da wpa a wep128 ovvero una pass lunga 13 caratteri asciii solitamente più compatibile.
altro qui:
qui è presente ogni indicazione: http://www.macfixit.com/article.php?...05093011343164
aggiungo solo l'ultima, specifica per leopard:
Leopard: AirPort cards not recognized, slow speeds
Droves of users are reporting AirPort difficulties after upgrading to Mac OS X 10.5 (Leopard). The most serious issue is one where AirPort cards are not recognized, disallowing access to wireless Internet services. Another group of users is reporting extremely slow throughput for AirPort connections.
If your AirPort card is not recognized, navigate to /System/Library/Extensions and drag the following files (if they exist) to the Desktop or another location outside the System folder (you will need to hold down the Command key while dragging the file to move it if you are not an administrator):
AppleAirport2.kext
AppleAirportFW.kext
Do not delete AppleAirPort.kext.
Restart your Mac and check for restoration of AirPort connectivity
Unfortunately, it does not appear that the same fix applies for slower-than-normal AirPort throughput.
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