If the PC with the ECS P4VMM2 motherboard is connected to a network with a hub or router check if you can see the other PCs assuming their sharing is turned on. If yes then it is possible that you have to simply set the IP Add, Subnet, specially the Internet gateway and DNS in your IP/Networking configuration of the P4VMM2 PC assuming you want to manually install these numbers and not to Auto Obtain. Just make sure you follow the numbers of the other PCs except for the last digit(s) of the P4VMM2 PC IP Add.
If you can not see the other PCs in your network, then it is possible that your lan cable is defective, try checking if the lights in your hub/router and/or at the back of your lan card lits up when you plug your cable both ends. If yes then it is good if not you have to replace your cable. Since you installed a new LAN card, I will assume that you have checked if the drivers are installed in the Device Manager and there are no conflicts or yellow mark(s).
Both versions of the ECS P4VMM2 (7.3 & 8.1) have built-in LAN, if you want to continue using the new lan card it might help conserve resources if you disable the built-in lan in your bios or use the original built-in lan instead and reconfigure.
In Win XP, try uninstalling the lan in Device Manager, on reboot it will be auto reinstalled and you can manually configure again.
If by a remote chance that you are using 98SE, try checking your root file MSDOS.sys and see if there is an entry that say Network=0, change it to 1.
I doubt if the motherboard is defective since you already tried installing a new lan card.
Good luck. Pls post again how things turn up. Kind regards.
on Nov 07, 2012