RIS Client can’t find dhcp server

I am attempting to use Windows 2000 RIS to load remote operating systems on some older computers. The network cards are supported by the remote boot disk. I know that I have active directory, DNS and DHCP available on the network. RIS and a Windows 2000 image are loaded on the RIS Server. Whwn I attempt to boot with the boot disk I get an error massage informoing me that the machine can’t find a DHCP server. What could be wrong?