Hi,
Can you provide some details about the IP address, netmask, DNS settings, and default gateway? The output of ipconfig /all would be useful.
I assume you are using the same settings that the old PC has from DHCP, or similar settings. When you configure a static IP address this way, you can troubleshoot a bit more by pinging the static IP (that you just configured). Next ping the default gateway.
Also try pinging some other things that are on the same subnet, if these exist.
You can also right-click the network connection and then click diagnose. This may provide some useful information.
It is doubtful, but perhaps the speed and duplex settings on the new PCs are not set up quite right. You can check this by right-clicking the network interface, clicking Properties, and then clicking Configure next to the ethernet controller name.
-Greg