HT205956: If the Ethernet connection on your Mac stopped working recently
Learn about If the Ethernet connection on your Mac stopped working recently
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Sep 19, 2016 4:43 PM in response to RiderBobby Kappy,Reinstall OS X Without Erasing the Drive
Be sure to backup before proceeding.
- Restart the computer and after the chime hold down the Command and R keys until the Utility Menu appears.
- Choose Disk Utility from the Utility Menu and click on the Continue button.
- After Disk Utility loads select the indented (usually, Macintosh HD) entry from the side list. Click on the First Aid tab, then click on the Repair Disk button. If Disk Utility reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button.
- When the process finishes, quit Disk Utility and return to the Utility Menu.
- Select Reinstall OS X and click on the Continue button.
If no luck: Make an appointment at the Apple Genius Bar for service. If needed find an Apple Store - Find a Store - Apple.