After installing Mac OS X Lion, Ethernet quit working

[Patcy]

I had a clean install of Lion and everything seemed to be working well. Suddenly, after three days, my Ethernet connection stops operational. I can continue to connect through my airport. I tried on another computer on my wired network and it worked fine, so I know that the network is to blame. Ethernet cable connection makes me lose my connection to the airport, even. Any thoughts?

[Zared]

1. While in Wi-Fi and Ethernet connection not load System Preferences, Network.
   
2. Check Wi-Fi is greens, others red.
   
3. Go away the Preferences display, Ethernet connection.

[Ebadaah28]

1. While in Wi-Fi and Ethernet connection not load System Preferences, Network.
   
2. Check Wi-Fi is greens, others red.
   
3. Go away the Preferences display, Ethernet connection.

The status changes to green for Ethernet. Other than still I cannot acquire an internet connection when I unlock my browser.