First board wouldn't post. RMA'd
Second board ethernet would not power. RMA'd
Ethernet controller doesn't work. How is this possible? How could it work then stop working after being put into my case.
As stupid as it sounds make sure all your mobo screw risers are where they should be as i had a friend kept having problems and couldn't figure it out till we took it apart and he had screwed one in where it shouldn't have been. Other then that if nothing else cover everything except your risers with brown cardboard if the problem still exists then it is a header causing it and if it is gone well either leave the cardboard in or try and figure it out.