Related your Wifi connectivity issue on your Mac device here are the top best possible solutions work all time when you can’t turn or enable wifi from your Mac running on OS X Mojave, High Sierra, Sierra, EI Capitan, Yosemite, Mavericks and any other or after updating your OS X. in the case when you turn Wifi and showing black triangle outline of the shape and not turning on, Mostly Wifi issues got user on OS X version 10.13, 10.14 or Other OS version. Are you one of them? Your home and office Wifi not working on Mac but other device working very well then just try the below steps perfectly.
The fixed solution on WiFi not working on Mac OS X: Solutions
Case 1: on the new update you might occur problem on PRAM memory and information that should be not updated successfully after update/Restore from old OS X. Some of the time PRAM memory use an external battery, so might be not working and out of date battery cant able to supply power, in this case, you have to replace it.
Case 2: in case of security purpose, are you using WEP encryption method, that means you can’t use 802.11b, Because Apple’s Airport standard hooked up with Wifi or Ethernet, Verify that Extreme card should be compatible with 802.11g and WPA2.
Case 3: iCloud might be crashed and turn off in this case you have to resolve it.
Case 4: Software update setting might be corrupted, Fixed it be updated or restore old OS X.
Case 5: Verify that if your devices running through Wifi Router and not be updated with latest firmware cause giving error and WiFi not working on Mac OS X.
Case 6: Distance Between your router and Mac device should not be closer than 1 meter and not longer than 50 meters.
Case 7: Contact your ISP (internet service provider) and Check it for the valid domain name.
Case 8: in you want wifi on hotspot connection and getting an error on particular browser surfing, Then try on other browsers Chrome, Mozilla, Opera and Other.
Case 9: Turn off Wake for network option inside the Energy Saver setting, Apple Menu > System Preference > Energy Saver. Easy solution for WiFi not working on Mac Mojave, OS X 10.9.3, OS X 10.9.4, 2013 iMac
Case 10: Many Users experience against some antivirus that has been blocked some wifi port and a cant open web browser or Application.
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Here listed cases are possible solution recommended by brody for fixed network issue in case Wifi not working on Mac Mojave, OS X, iMac, MacBook pro, MacBook Air and Others. After that, you can’t short out your wifi issue than contact Apple support.