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E7470 / Mac OS 10.12.6 - Wi-Fi works, wired Ethernet doesn't.


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Hey team. This is easily the nicest "Mac" I've ever owned. Thanks again a million times for maintaining this site, and for helping me and everyone else so often and so well.


My latest hiccup is wired Ethernet; when I plug in the cable, under Network Preferences it flips back and forth between "unplugged" and "no IP address":





It's a known working cable, and I have both a link light and an activity light on the back of the laptop. What other info would be helpful to troubleshoot this?


Thanks in advance!

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