|Well, the things that immediatley spring to mind is that both ports are damaged, but there are a few tests to check if they are still alive|
When you plug the ethernet cable into the motherboard connector, does windows report any connection at all, or does it report a "limited or no connectivity" like the other connector.
Are you able to test out setting a static (manual) IP address.
If you do that, and are able to ping other machines, then there may just be a configuration problem from within windows.
Hopefully this will help!
Edit: Before this happened, which connector did you use for access, and was there any reason for this? (speed, problems...ect)