Reinstall drivers, same thing, with a great error message, 'If deep sleep mode is enabled Please plug the cable.' Checked BIOS, onboard LAN is enabled.
Didn't show up in hardware manager, nothing. Had a problem with one of the home pcs today, came out of sleep (S3) and there was no internet. Solved problem, thought I'd post if anyone else with a Realtek onboard nic runs into the same problem.