Macbook Pro can't see ethernet connection

I have a late 2008 2.53 GH MBP that has this exact same problem. One day last week I was connected to my work LAN via Gigabit ethernet and, when I tried to re-connect later that same afternoon, it was as if the ethernet port had "died". No matter what I, or my IT staff, tried, in "System Preferences" it always appeared as if the cable were un-plugged. Extremely frustrating! Took it to the local Genius Bar this morning and it was diagnosed as a bad logic board!

Same problem here. Apple has already replaced the motherboard once on a recently purchased machine and is about to replace it a second time.

Appears that there are some serious quality control problems with both the NVIDIA Ethernet and graphics chips. Not good...

-Joseph

Just chiming in that I too had to have a logic board replacement due to a failed Ethernet port....


Hope this one holds up.

I too just got my MBpro back for the second time. Sudden ethernet port death both times. It was plugged into a normal Linksys 4 port router. First time, Apple replaced the logic board. Can't tell from the paperwork if that was their second solution. Don't waste time calling Applecare. They will only walk you through Network Diagnostics and power cycling the router and computer.

My port just died yesterday. I have had the computer since November. It says that no cable is plugged in yet I can move the same cable to my G5 and it works just fine. Won't be able to take it to Apple to get it replaced for another 3 weeks though because of work. 😟

This same exact issue just happened to me today. I cannot connect via ethernet. It says the cable is not connected but it is! Extremely frustrating for a 3000 dollar macbook pro. You would expect this thing to not have problems. I have had it since January, going to take it to the apple store tommorow and see if this can be fixed.