Cannot chain load gPXE to Windows 2003 DHCP

I have been for the past 2 days trying to get a laptop to boot to an iSCSI Target and had various luck.   I created a USB key with the gPXE and was able to boot from a new HP Laptop - only if I manually entered DHCP Net0, then Set keep-san 1, then connect to the iSCSI target.  Once that was done - even when it could not boot to the blank target - Windows 7 booted, saw the disk but I ran into the problem where it says cannot install due to pc not supporting in BIOS to boot.   I gave up on that.

Put the same USB key in a Dell D600 laptop with the hard drive removed - it never boots.  Gave up on that.

Created a clonezilla usb key that has gPXE on it - that boots on the Dell D600 but I have to manually do all the same commands DHCP NET0 etc.etc. - but in this case - Win7 does not even see the iSCSI drive.

I think this could be DHCP issues related to the boot file - unless that is only when I boot thru Pxe (the USBkey should have worked).  So, after giving up on the USB route - I am trying to chain load this and the docs on the site seem incomplete.   Do I need to make a script as the page shows on the DHCP 067 option - tftp://servername/tftpscript.txt and also a second 067 that is the boot file name.  I setup a Windows 2003 tftp service on a web server, dhcp is on another server - I can manually from a PC run TFTP x.x.x.x GET undionly.kpxe and it copies it over - so I am pretty sure that works...but my question is what belongs in the tftpscript.txt file?   Does this need to call the undionly.kpxe, load the DHCP NET0 or is that what DHCP is supposed to do?

I feel close to making this work, but yet not quite there with missing info.  The fact that the HP booted on the usbkey and the Dell did not - could be age of the dell or broadcom NIC vs. the Realtek on the HP - but the chaining has gotten me stumped.   I am more windows than Linux - so am just trying to get this to work to be able to load up an iSCSI farm of images to boot from.

Hope someone can help direct me to the right fix.

Ron

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