What to do when OS X says Wi-Fi hardware isn't installed - Macworld
 

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What to do when OS X says Wi-Fi hardware isn't installed
Macworld
If hardware is the issue, the Wi-Fi drop-down menu will read â??Wi-Fi: No Hardware Installedâ??. That's either a low-level configuration issue or a hardware problem. You can try to clear the hardware state by resetting the non-volatile memory (NVRAM) or ...





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