oltre che quello leggi numerose volte nel forum, più volte anche un tutorial specifico, di nuovo per mac OS 10.5.6 c'è questo, tratto naturalmente da macfixit: (che poi cosi nuovo non è. i consigli sono più che conociuti)
infine, come è noto, non puoi disinstallare un agg. di sistema. puoi reinstallare (archivia/installa) e fermati alla versione precedente.Airport
Some users are having problems connecting to wireless networks after applying Mac OS X 10.5.6. Some have described Airport Extreme connections dropping out, and others have suspected either WEP or WPA protection being the culprit. However, in most cases these problems seem to have self-corrected after a while of usage. As such, it is recommended to restart the computer when this problem happens, and perhaps also run permissions and disk repairs with Disk Utility. Additionally, try resetting the wireless routers the computer is connected to, in order to refresh the connection and IP address lease information in the router.
Some users might get an error claiming no AirPort card is installed, but resetting the PRAM in the computer seems to clear this problem up.
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