Cannot connect to internet with iMac connected to airport via Ethernet

Hi all,
Firstly please forgive if this problem has been posted before but unfortunately i haven't yet been able to find a solution to my problem.
I cannot seem to get my wireless network to work since updating my Airport to v5.7. I have reverted back to 5.6 but with no joy. OK, here's my setup - I have an iMac G5 1.8 which is connected to my airport via an ethernet cable (it is plugged into the correct port) and an iBook with an Airport card to connect wirelessly. The airprot is connected to my ADSL modem which is a D-Link 300T. When set up like this my iMac cannot connect to the internet even though my iBook can. When i take the4 iBook and Airport out of the equation my iMac connects fine to the internet via ethernet cable direct to my modem.
As i've said, as soon as i bring in the iBook and Airport the iMac cannot connect via airport extreme, even though the iBook can connect.
I have searched through the discussions looking for clues and answers. I have made sure that distrubute IP address is not checked and that internet sharing is off on my iMac but on on my iBook. I have tried all channels and all possible different settings on the airport admin utility but nothing works.
I hope i've given enough information to give a clear indication what is wrong, if not please ask and i will try my best to answer. Any help would be much appreciated so i can convince my girlfriend that buying my iBook was not "a waste of money!".
Many thanks in advance,
Carl.

Same questions as Paul.
Open up the Network System Pref on the iMac G5.
If you pick Show: "Network Status", what do you see ? Be precise.
If you change Show: to "Built-in Ethernet", what do you see on the TCP/IP, PPPoE and Ethernet tabs ? Again, be precise.
On the Network Status, you should see a green mark next to Built-In Ethernet, which should be at the top. It should also give you an IP address and tell you you are connected to the Internet. Well it would if it was working, so "say what you see".

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