Ethernet not working... self-assigned ip almost everytime

Hi,
Just having a few issues with my new macbook. Everytime I try to connect to a router or an internet connection with an ethernet cable, after my macbook attempts to connect it comes up saying self-assigned address and connected.
The issue is everytime I have DHCP enabled and every PC I connect with the cable, works first time, everytime.
Just a little concerned I may have a hardware issue since it seems really strange that this would work.
I should add that occasionally it does work (maybe 1 out of every 20 or 30 attempts) and as long as i dont disconnect it is fine.
I have tried restarting the computer, updating to the latest software, but still not change.
Has anyone experienced anything similar and/or have any ideas?
Thanks,
Jake

Hi Dave,
Thanks for answer.. The issue is that its not just on one connection. I live in student housing and we just have to plug a ethernet cable into the socket on the wall and it is meant to receive an ip address from the dhcp.. i can assign a manual one, which iv tried after recording the ip the dhcp gives me, but eventhough it says connected, it still doesnt work.. Since then I have tried at university, with the same problem of getting a self-assigned ip.
its gotten to the point where i purchased a wireless router so i could plug that into the wall at home and have wireless internet, funny thing is i couldnt set it up because when i tried to use the ethernet cable to connect, i had the same problem. Had to borrow my girlfriends pc to get it up and running.
Thanks for your assistance. I'll be sure to try what you suggested when i get home but i still am worried its a hardware issue as its happening at different locations.
cheers,
Jake

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