Network Problems

Hi

I have an iMac, and a Macbook. My imac is on leopard, whereas the macbook is on 10.4.10.

My macbook connects to my school network straight away, but my imac asks for my username and password. It doesnt accept the correct password (i checked it on a school machine). Does anyone know what the problem might be?

Thanks

Maybe your School uses a Directory (such as Open Directory or Active Directory if Windows) for users to login, this is configured with the Directory Access tool.
Check with school technician...

But surely it would affect both computers and not just the one on leopard.