I have the same problem. Ethernet just keeps saying "cable unplugged". This is what i've tried that HASN'T worked.
- made new user
- reset PRAM
- reset SMC
- changed locations
- deleted and tried to re-add ethernet (it wasn't even listed to be able to add it)
Bugger of a problem. I wonder if Apple are looking at it.
Thanks for your hint andreschouhy,
but it doesn't fix my problem:
The "ethernet" opportunity in the drop-down menu in "Preferences" --> "+" --> "connection" isn't available any more [only: AirPort, FireWire, Bluetooth-DUN | VPN, PPpoE, 6 zu 4]*
The same if I create a new network location system.
*German language installed, hope the translation is correct
Found solution in: https://discussions.apple.com/message/15484382#15484382
No ethernet after 10.6.8 update. But AirPort worked. So I switched to wireless.
I thought Lion would solve the problem, but it did not. Still same problem.
The Solution for me:
Starting in safe mode.
Now I'm able to add the ethernet option as connection which wasn't there until now.
The added "Ethernet" functionallity (cable LAN) is now labeled on the left side as: "AirPort" and the Wireless is now labeled as "Wi-Fi". It looks confusing, but the functionallity is there.
Perhaps someone knows how to fix this "labeling-problem".