After upgrading my Dell XPS 8700 from Windows 8.1 to 10, the Ethernet stopped working. It's not found in device manager, so the uninstall/reinstall of the driver did nothing. It gave me the "The Realtek Network Controller was not found. if deep sleep mode is enabled please plug the cable." I've even reset the motherboard by taking the mother board's battery out and letting it sit for a while with the power disconnected. This did not fix the issue either. If anyone has dealt with this since the release of Windows 10, any help would be appreciated.