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You are then presented with a menu option to Open Wireless Diagnostics. Wireless Diagnostics are run on a Mac by holding down the option key while clicking the WiFi icon. This showed the Software Versions but there were no interfaces present.
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I first entered the Mac’s System Information screen and scrolled down to the Wi-Fi section under Network. Top 8 Ways to Fix WiFi Not Working on Mac Computer 1. This message in itself gave me the clue that none of the troubleshooting steps I was about to implement were likely to result in a resolution as the internal WiFi hardware had probably failed. Nevertheless, I set about confirming this scenario, and the following are the troubleshooting steps I followed. After clicking on the icon we were presented with the message WiFi: No hardware installed. There was indeed an X in the centre of the WiFi icon. Not only had the WiFi failed but the client had been using a Bluetooth keyboard with it as a number of the keys on the MacBook keyboard were no longer functioning. My assumption had been that we were dealing with a Windows computer, but it turned out to be an old MacBook running OS X El Capitan. On arrival with the client, my plans were immediately turned on their head. If this didn’t resolve the issue I’d be assuming the WiFi hardware had failed and the easiest solution would have been to implement a USB WiFi adapter.
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Assuming it hadn’t been disabled I would uninstall the existing WiFi driver and then reinstall it. I would first check whether the WiFi had been accidentally disabled.