Trying to image a Dell Vostro 1510, PXE boot working fine, comes to Imaging screen, choose maintenance, runs for awhile and then says

Runs through boot/linux first, seems fine there, but then runs through boot/initrd (kinda slow, but does it) and then shows the Zen imaging screen (blue).

Comes to the main menu, defaults to start installation or system, OK, then says start Installation, OK, then asks for network protocol, choose tftp, then it hangs on the DHCP request.

Driver problem with the NIC?

Before boot it tells me that it's a RealTek Gigabit Ethernet controller.

Any ideas anyone?