“Recently, Mac 911 has had a large number of reports from people who have suddenly found their Mac has lost track of its Wi-Fi adapter,” Glenn Fleishman writes for Macworld.

“Typical is Sarah Clark, whose daughter had intermittent Wi-Fi dropping for a morning, and then the connection failed,” Fleishman writes. “The Wi-Fi menu appeared with an X in its ‘fan,’ and when clicked showed the message ‘Wi-Fi: No hardware installed.'”

Fleishman writes, “If you see that message, something worse is afoot than a software configuration problem.”

Read more in the full article here.

MacDailyNews Take: Sometimes it actually is a physical thing, like a loose antenna.