Dimension E520 won't Image

We just got in a new batch of dimension e520s and they won't image. I
have OES 6.5 with the latest service pack and I'm running Zen 7.0.1. I
can PXE boot the machine and select maintenance mode from the Zen menu.
The machine downloads the software off the server but when it starts to
run I get the error "No Network Device Found, Load a network Module First"
The nic is an onboard nic and I believe it's intel. Any thoughts?