I got it now.
My Intel 82578DC port is working fine.
I did a fresh installation of SL, followed Boot Cd method.
In STEP 3:4, I dragged Tonys IO netwoking family kext to kext helper
After repairing permissions (I didnt check for ethernet access
)
Installed 10.6.2 update, then Voodoo kexts, then I ran kext utility, restarted.
Checked Network in Sys Pref while clicking ethernet it automatically configured
settings and amber light turned to green.
Am posting this from Mac OS .
THANKS A LOT TONY - YOU ARE THE ONE
THANKS CHABRO
Now in INTEL DP55WG main board except firewire everything works fine!
I would recommend this board.