G4 iMac will not connect to internet

Hey all.
Got in a G4 iMac 17'' 1GHz. It will not connect to the internet thru ethernet. It works fine through AirPort though. I've tried everything I can think of. Reinstall the OS, create a fresh user account. Nothing works. I'm guessing there is something wrong with the ethernet connector on the logic board. The computer was dirty and had a lot of water marks on it like it had been sitting next to an aquarium so my guess is water might have gotten in the bottom.
Think I'm right? Or is there something else I can try?
Thanks in advance.
Thomas

I've never had to use it, but the OS X CD/DVD that came with the system provides a set of diag tools. You boot from the disc, and run these tools to check hardware on the machine.
I am sorry I don't have any further clue on that specific tool set or how to use as I never have. I simply know it exists.
Quite sure a bit of searching on the forums here will reveal the boot-disc options, etc. Heck... you may find info on the disc itself, try inserting it, opening and see what is what.
Beavis2084

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