Supercoe,
There's a few things you may want to try or check:
\* Check that the configuration file (/var/public/tftproot/.sif) is in dos format and not in unix format.
\* If you added lots of tools to the bartpe distribution then you may have exceeded the ramdrive size that is being created. Standard ramdrive size is OK for default BartPE distribution. Try with the default bartpe distribution first.
\* Try creating the bartpe image from the same iso file/cd that you used for the w2k3 iso import.
\* Try using an SP1 or higher Windows 2003 CD. Just download the trial version of the enterprise edition from the microsoft site
If things still do not work let me know and please specify when the blank screen occurs, do you see the progress bars loading the bartpe iso image? Do you see the windows starting progress bar?
Good luck!