Can't Acquire IP Address - Please Help!

Please help! I recently bought an aluminum macbook and despite having no problem connecting to my home network through airport, have been unable to connect to the network at the school where I teach.
We have several mac experts at my school, a mac lab, and a mac specialist at our school board, but no one has been able to help me. Here is how my most "mac literate" student describes the problem I am experiencing:
The computer cannot acquire IP address from our wireless network.
We have tried multiple logins (including one that is known to work on the network from another computer) but we still cannot get an IP address.
We are able to authenticate to the router but we cannot receive a DHCP lease regardless of settings and configuration.
The problem is not the account information. Can't be hardware because wireless works at home and in other locations. What is going on here, and how can it be fixed? Others with the new aluminum macbook at my school have not had this problem.
If I am unable to get online with this computer at work I may need to exchange it for another or abandon it altogether --which as a 20 year mac user I am loathe to do. I need online access for my job. Please, please help me figure this out

Well sounds to me like they might have MAC filtering . No, I do not mean apple macintosh but Media access control addresses. The wifi may lock down by the unique hardware address of each and every piece of netowrking equiptment.
If you are so desperate for work connectivity, why not get the static ip address information adn enter that in to see if you can connect. If you still can not after that then you need to ask the IT staff at your school for access.

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