After upgrading to Mountain Lion on my backup laptop (old work laptop), the airport card wouldn't turn on.
This blog post had the fix for me. Details below:
This blog post had the fix for me. Details below:
- Open Network preferences.
- Remove Wifi/Airport interface by selecting and pressing (-) button.
- Press/click "Apply".
- Restart computer.
- Open network preferences.
- Pres the (+) button under the interface list.
- Select "Wi-Fi" in the interface type list. Give it a name (the default is fine). Press "Create".
- Press/click "Apply".
- Turn on Wi-Fi.
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