Can you open a new console under the PXE window and enter "pxemenustart" command?
I too faced this kind of issue at one of the customers site as there was an issue with resolving LANDesk core's name by DNS server. PXEMENUSTART command will let you know what the problem is if this is the case.
I can start a new console with the PXEMENUSTART command but it is empty too ...
The problem i think is from my IIS config as the pxemenustart can't download dosmenu.cfg
I think you must configure your IIS settings to get all file extensions you need... see:
LDMS 8.8 User's Guide (page 169, chapter Configuring IIS 6 Web servers for software distribution)
Is it possible to map a drive in your PE? Perhaps the network card driver for your hardware is not
Do you know this doc: Blank PXE boot menu in Windows PE
I make a Mime Type Extension * with type application/octet-stream
It seems to now work ...