No WIFI and no Internet Connection after Mojave installation

Please post an EtreCheckreport of your system. We can then look for obvious issues. Please click the link for the free version, download the app and run the report. Once you have the report, please copy and paste it as your reply to this post.

Please try the following, in order. Stop at any step where the Internet connectivity issue is resolved:

1. Boot up your Mac in Safe Mode.

   What: Use safe mode to isolate issues with your Mac- Apple Support

   How: At boot-up, hold down the <shift> key until the Apple logo appears on the screen.

2. Run Apple Diagnostics to uncover any hardware issues with your Mac.
   • How to use Apple Diagnostics on your Mac - Apple Support
   • Apple Diagnostics: Reference Codes - Apple Support
3. Boot up your Mac in Recovery or Internet Recovery Mode.
   • What: About macOS Recovery- Apple Support
   • How:

     For Recovery Mode: Immediately after pressing the power button, hold down the <command><R> keys until the Apple logo appears on the screen.

     For Internet Recovery Mode: Immediately after pressing the power button, hold down the <option><command><R> keys until the spinning globe appears on the screen.

     When at the initial Recovery Mode screen, select the Disk Utility option. Run Disk Utility > First Aid to verify the startup disk's integrity.

   • Why: To verify the startup disk integrity using the Disk Utility's First Aid option.
4. Boot up your Mac in Recovery or Internet Recovery Mode a second time.
   • Why: To verify the integrity of the built-in AirPort wireless and Ethernet connectors.
   • At the Terminal command prompt, enter: ifconfig -a <return>
   • We want to verify the status of both the Ethernet (en0) & wireless (en1) of your Mac. When properly enabled, the value for "flags" should be UP and for "status" ACTIVE
   • If either are not enabled, then enter the following Terminal commands:
     • For Ethernet: sudo ifconfig en0 inet up <return>
     • For wireless: sudo ifconfig en1 inet up <return>
   • Run ifconfig -a again and check the status flags for each of these. Did they change to enabled now? If not, go on to the next step.
5. Make a Genius Bar appointment at your local Apple Store or Apple Authorized Service Provider.
   • Check Your Service and Support Coverage- Apple Support
   • For getting the right support, here's a genius idea- Apple
   • To contactApple Supportdirectly.

   You can only make 1-week ahead appointments either via the web link above or AppleCare phone support. The appointment timeframe is longer if you go in-person to an Apple Store.

If you have access to another Mac, download the app and copy it to a Flash Drive and then copy to your iMac.