Is my ethernet port broken?

Im on a macbook (black, model 4,1), and it seems my ethernet doesn't work. When I plug in the cable, System Preferences > Network says:

alt text

This suggest that the ethernet card is at least partially aware that there is a cable connected, and that's why I'm not 100% sure it is a hardware issue. The yellow light is consistent; it doesn't switch between green/yellow/red. Without a cable Network (obviously) says:

alt text

The network is configured with DHCP. Info:

I've tryed plugging in other mac's and it configured automagically; worked straight away
Internet works fine when the same cable is connected to my Airport
Ethernet card is Marvell Yukon Gigabit Adapter 88E8055 Singleport Copper SA
Ethernet doesn't work in Ubuntu either
I can't ping anything.

So, bottom line: is the ethernet card broken, or could this be a software / configuration issue?

trolle3000

Posted 2010-03-04T03:07:33.410

Reputation: 1 670

are any other computers on your network having problems getting an IP address? – squircle – 2010-03-04T03:10:16.993

Nope - when I connect on wireless instead, using the same cable and my wireless router, there are no problems. – trolle3000 – 2010-03-04T03:14:28.590

Answers

The only thing I can suggest is try to set the IP manually - it could be some program is interfering and not allowing the interface to acquire a DHCP address (but unlikely as you have tried through Ubuntu).

If it still does not work, you have really tried everything that I would other than to use a separate router (just to rule out some freak compatibility problem between network card and router!) - so I would say that the socket is broken.

William Hilsum

Posted 2010-03-04T03:07:33.410

Reputation: 111 572

I'm going to try with another router. – trolle3000 – 2010-03-04T04:18:29.613

If you can connect to another router using the same cable, it's not your NIC. It's probably the first router. Did you reboot it?

goblinbox

Posted 2010-03-04T03:07:33.410

Reputation: 2 414

I've tried multiple times with reeboots in between. Sounds right to try another router... – trolle3000 – 2010-03-04T04:19:36.587