Self-assigned IP adress problem.  What if none of the fixes worked?

I just developed the "self-assigned Ip adress" at my college last night. I've been up all night on forums trying to solve the problem and tried about everything.
I've:
Tried to Renew DHCP Lease. (does nothing)
Manually input ip address. (doesnt work because the college uses a dynamic ip instead of static)
Opened the firewall to allow all connections. (I think it already was open)
Created a new location. (nothing)
Run diagnostics about 10 times. (prompts to reset router or modem, which I doubt is the problem since my roommate's laptop works fine)
Created another ethernet connection. (nothing)
Repaired the permissions. (nothing)
Can't think of what else I did, but I'm thinking it could be an issue with the 10.5.5 update, so if nothing else works, I am planning to use my OS disks to reinstall OS X (I think it was 10.5.3 when I bought it.)
If there is an easier way, please advise!
Any help would be greatly appreciated.

I too am having this problem. I just updated from 10.4 to leopard, and could not connect due to the self assigned IP. Found somewhere online on another computer that you can shut down, restart and hold down the shift key to boot up in safe mode. Then restart, and everything works, normal IP. I then did software update, to get the latest leopard updates, and had the same problem, used the same fix. I was coming on the forum to ask if anyone else had this problem and to see if there were any explanations. Hope this works for you. I will keep reading to see if anyone else has an explanation. I also noticed that Internet connect is no longer part of OSX. I travel a lot and that function has helped me connect in many places, so I hope it's exclusion won't mess me up.

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