Mac does not recognize Ethernet after failure

We had a brief power failure this weekend and a couple of my Macs a brand-new Macbook Pro 15 "and iMac 21.5" end 2013 do not recognize Ethernet. tried several possible fixes I found online remove various preferences and other files that nothing worked.  I tried to remove the Ethernet interface to see that when I wanted to add once again it was no longer available in the interface of the menu drop-down.  I rebooted, zapped the PRAM and removed from many many files of network preferences, but nothing could him recognized through the thunderbolt adapter Ethernet of Ethernet

At this point, I gave a little and save all the information of the user, a re-installed the operating system on the existing system using the network of restoration (R command).

Everyone has had this problem before?  Is there an easy fix?

Reset the SMC

Reset the management system (SCM) controller on your Mac - Apple Support

The failure could have messed with the SMC on the computer, which essentially controls how the power is sent to the device.

Also, have you tried to connect the devices with a new Ethernet cable? The cables themselves could have been damaged, or even of your router.

Best way to test is to take one of your devices to somewhere with an Ethernet cable to test Ethernet computer port. This could be done in an Apple store if you are near one. Would help to determine if there is a problem with the computer or the router/modem or cable.

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