try install this ethernet kext using Kext Helper b7 and hopefully it should help. i think the problem is you dont have the correct ethernet kext so your onboard ethernet is not being detected. (This is for an nForce LAN Motherboard) with which a little google search i found out this is what you have.

hope it works

Attached Files

forcedeth_0.3_leopard.zip (897.2 KB, 48 views)

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iMac ::: Mac OS X 10.6.1 ::: Intel Core2Duo 2.93GHz ::: NVIDIA Geforce GT 120 256MB ::: 4GB DDR3 RAM

Milanca Project ::: Mac OS X 10.6.1 Retail ::: Vanilla Kernel ::: Intel Core2Quad Q6600 2.4GHz ::: NVIDIA GeForce 8600 GT 256MB ::: 4GB DDR2 RAM ::: GIGABYTE GA-EP35C-DS3R