Windows 8.1 Upgrade problem with Ethernet on a Flex 15

Windows 8 was upgraded to Windows 8.1 Upgrade on a Flex 15.
The first time I tried to do the upgrade, I had enough problems that I re-installed from a Windows 8.1 image. All went well and all the drivers work except the Ethernet. The upgrade was relatively painless if you ignore the necessary reboots.
The latest Ethernet driver was downloaded from Lenovo and it was upgraded through Device Manager to version 8.26.218.201
In spite of Device Manager saying the Realtek ethernet adapter is working, no network is recognized by Networks and Sharing Centrewith when an ethernent cable is plugged into the Flex 15 i. The cable is good and has been checked by way of another computer.
I have previously used the hard-wired ethernet once and it worked but I do not remember where the laptop stood during the pgrade path.
This may be a hardware problem which will require mailing the laptop for the repair, or it may be a software / dirver issue.
If anyone has a suggestion, please let me know. The only other thing I can do is reistall from scratch to confirm it is a hardware problem.
With thanks in advance.
Solved!
Go to Solution.

OK So I'm not the smartest cookie in the cookie jar.
The Ethernet worked all along, but I inserted the ethernet cable UP-SIDE-DOWN. The Flex 15 has a 1/2 size ethernet female plug and it has a small cover which flips down. This is to allow the adapter in a thin shell
The male end can be plugged in upsidedown unlike a normal-sized ethernet female. It goes in, but does not click. So a word to the wise ... the plastic prong of the male end is on the bottom.

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