Ethernet not working, strange problem

Hi Everyone,
I have a very strange problem. I haven't had internet at my new apartment all summer and have been using my schools internet to use the internet. I typically would go to the computer lab and use the ethernet cable to plug in and it worked fine. However the other day i went to a different room and connected there and that worked fine, but now if i go back to the computer lab it says my IP is being used by another device.
Stranger further, now that i got internet at my place my computer won't even read it, it says its connected but can't get online, while my suitemate has no problem what so ever. Any hints as to what might be going on?
The thing is if i go back to that classroom and plug in it works but anywhere else my ethernet connection does not work.
I have a MacBook Pro, bought last summer running Lion.
Jacob

I am having the same issue, Jacob.  In late August, I was working on a wired network at a hotel during business travel.  One day, I was fine.  The next morning, I received the same information...that my IP address was being used by another computer.  My business partner logged in to the network from his Linux machine without this issue, so it isn't the cable or the network itself.
I am now unable to login on any wired network.  And it now appears I am unable to create an ethernet connection anymore.
Has anyone resolved this issue?

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