No internet connectivity after install and WIFI greyed out with 'X'

[Red_F1ve]

I have just upgraded my 2017 (late) iMac to Mojave and the wifi is now greyed out and has an X. Also the Ethernet connection does not work. I am not running Little snitch (beta testers told everyone to upgrade that) and when I went to log in it took for ever and I have just restarted the iMac and we are looking at 20 mins plus so far to restart.

Any help?

Thanks

 

[rjjacobson]

I installed on 3 machines two 12 2015 MacBooks and a 15 inch MacBook Pro (late 2013) and one of the 12 inches (my wife of course) failed like this. The finder was also flaky after this along with the WIFI missing. I followed lots of suggestions but with lots of beachballing and flaky ness of finder I gave up. Other choice was a clean install and then trying to add my wife’s stuff back in not a choice I am willing to follow. I gave up and took her 12 inch back to Latest backup of. High Sierra. To much to set up for her TA job, accounts and such at school so not going to put Mojave on this. It was gonna be last install I did on this 2015 12 inch macbook but not now. It was a used machine so something in it does not like the Mojave and too much work to do it via clean install and setup things the way she. Had them so its done and working fine back in High Sierra

 

[tmcnulty1381]

I have just upgraded my 2017 (late) iMac to Mojave and the wifi is now greyed out and has an X. Also the Ethernet connection does not work. I am not running Little snitch (beta testers told everyone to upgrade that) and when I went to log in it took for ever and I have just restarted the iMac and we are looking at 20 mins plus so far to restart.

Any help?

Thanks

[doublepost=1537834668][/doublepost]Can’t use networking, WiFi says no hardware installed. Wired network same.
Reset nvram and smc. Did disk first aid, all fine. Reinstalling os from
Cmd-r menu. Third time ....

 

[rjjacobson]

[doublepost=1537834668][/doublepost]Can’t use networking, WiFi says no hardware installed. Wired network same.
Reset nvram and smc. Did disk first aid, all fine. Reinstalling os from
Cmd-r menu. Third time ....

Yep same issue and things that did not work for me either....
I gave up after trying all that, short of a clean install and put last High Sierra on wife laptop. It was not worth the time to do fresh install and spend whole day installing apps, passwords and such and so forth. Was hoping to keep her laptop uptodate one more time but not working. Given my 12 inch and 15 inch worked fine not sure what was wrong with hers.

 

[NastyNatex]

I made an account because I was having the same problem and fixed it. Their is two methods to fix this.

First Method:
it was a corrupt plist. I turned off my WiFi and then deleted this in terminal:

sudo rm /Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist

After restarting the Mac, I rejoined my WiFi (had to put in the password since you lose all saved passwords when destroying that file) and tested by rebooting my Access Point. The Mac automatically reconnected when the WAP came back up.


My Second Method:

• open network preferences
  
  
• select wifi
  
  
• click the minus (-) symbol (it deletes the wifi option)
  
  
• click apply changes
  
  
• restart computer
  
  
• click the plus (+) symbol
  
  
• add wifi
  
  
• profit

All was taken from the internet and helped me. Hopefully these methods help you guys aswell

 

[tmcnulty1381]

Tried these suggestion but no luck. The OS too far gone. Bluetooth flakey, not seeing the
Mouse or keyboard on boot. USB disks not visible but Disk untilty does. Going to Apple Store
Thursday. Thinking the internet connection corrupted the download or the two month old iMac is
Very sick. Reading all the other fun stuff about Mohave, will go back to HS.

 

[Red_F1ve]

Tried these suggestion but no luck. The OS too far gone. Bluetooth flakey, not seeing the
Mouse or keyboard on boot. USB disks not visible but Disk untilty does. Going to Apple Store
Thursday. Thinking the internet connection corrupted the download or the two month old iMac is
Very sick. Reading all the other fun stuff about Mohave, will go back to HS.

Clean install worked but not ideal situation to be in. Surprised how hard the upgrade was.

 

[davidjmarks]

I have just upgraded my 2017 (late) iMac to Mojave and the wifi is now greyed out and has an X. Also the Ethernet connection does not work. I am not running Little snitch (beta testers told everyone to upgrade that) and when I went to log in it took for ever and I have just restarted the iMac and we are looking at 20 mins plus so far to restart.

Any help?

Thanks

[doublepost=1537928015][/doublepost]I had the exact same problem with the exact same iMac. I posted about this in another thread. Resetting SMC and NVRAM/PRAM only made it worse. Restoring from my last High Sierra backup got me back to a usable system.

Apple support told me to wait for 10.14.1.

 

[IEatApples]

Sorry if I'm a bit late with this response, but I just got (and fixed) this issue today, so just in case someone else gets this problem I think it's worth sharing (even though the internet is very sensitive about "old" threads")

This is a solution that I found in this thread:

https://discussions.apple.com/thread/8558304

After I updated my MacBook Pro 15" from 2015 to Mojave (macOS 10.14), I suddently couldn't use the wifi. It said that I didn't have any wifi hardware installed.
In addition to not having an intenet connection, the machine also became ridiculously slow and unresponsive. I then used one of my other computers to search for
answers, only to find that a lot of people were struggling with the same issues. The following "fix" told me to use a sudo command to locate the file, but this
didn't find it for me, so I did the following that did work (although the sudo command may work for others):


/Volumes/Macintosh HD, got to /etc/ and rename/delete the sysctl.conf file, then reboot!

The "etc" is a hidden folder that lies directly under "Macintosh HD", but you can easily find it by selecting "Go to folder" in the finder menu,
and then search for "/etc/". In the "etc" folder you may (if you are having this problem) find the file "sysctl.conf". You must either delete or
rename this file (I deleted it). Then the final step is to restart the Mac! ... And hopefully this solves your problem (like it did for me)!