I've discovered that my ethernet 2 port on my mac pro is not work. When i plug my internet into it it does not connect properly, when ethernet 1 works fine. But when i plug in the cable to ethernet 2 it does change the state in system preferences and reads that the connection has a self attained IP but may not be able to connect. This makes me think that its not a hardware problem, but I'm not sure. anyone else experience this or know what to do? ultimately I'm trying to connect a network backup drive, which seems to connect from ethernet 1, but again not from ethernet 2.