PXE-E53 "No Boot Filename Recieved" -- Verizon Router DHCP

Hello, I am new to Cobbler in the sense that I've dabbled with it in the past but have never really gotten it to work. I need help with a PXE booting issue. My goal: to be able to install Fedora 14 x86_64 on a desktop machine with a new hard drive. I want to do this using cobbler with a kickstart file that I have edited myself. Later, when I'm satisfied that the Kickstart installation works, I want to replace the system with a new motherboard and processor. The cobbler server has been installed on a laptop. This is another Fedora 14 x86_64 system. It was frustrating at first until I disabled SELinux, which has been running in full enforcing mode. A DVD iso containing the Fedora 14 distribution has been mounted to /mnt/dvd. httpd is running and I set up symlinks in the web content area that point to /mnt/dvd. I also did a 'cobbler import' on the DVD. The cobbler server and the the system to which I want cobbler to install Fedora 14 to are both connected to a Dell PowerConnect 2716 switch and this in turn is connected to a Verizon router which provides internet access and DHCP service. All the DHCP is done by the Verizon router. I've never changed settings in the router. My problem: when I turn on the machine that is to PXE boot, I get a PXE-E53 error message: "No boot filename recieved". How do I fix this in terms of a Verizon router/DHCP service so that the machine I want to install Fedora to using Kickstart "sees" the Cobbler server properly and works with it? Thanks Bob Cochran