"The Cable for Ethernet is not plugged in": Ethernet port stopped working

This happened to me on a 17" MBP in April, and now in a new 17" MBP. I find it too coincidental that this has happened RIGHT after several Apple Mac OS X updates this week. I don't believe its hardware as the diagnostics pass. I have tried the computer on several known working ethernet cables and no dice. A survey of the other discussions show this is not an isolated problem, but for me, neither resetting the power management, zapping PRAM, deleting then adding the Ethernet Interface in the Network Sys Prefs, or running Cocktail's scripts and cache cleaning has made a difference. Anyone have another idea?

I also got my MBP 17 in the middle of April. Everything worked great until around May 9th. Then I suddenly got the "cable unplugged" message for my ethernet, and nothing I can think of will fix it.
I have tried multiple modems, routers, connections, and cables, along with the suggested PRAM reset, deleting and adding the Ethernet Interface, and everything else I can think of or find online. The computer is going in to IT tomorrow anyways, so I will let you know what they have to say about it.

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"The Cable for Ethernet is not plugged in": Ethernet port stopped working

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