Many thanks for the reply Peter.
I have done some more investigations and find the following.
(All PXE services throughout this exercise have been checked as running.)
Rolled back to a 9.5 SP3 install of LDMS. All PXE services work as expected and I can boot to a template.
Upgraded to 9.6 with NO service pack. No networking was changed at all throughout this testing.
Although the PXE menu has changed, lots of the DOS stuff removed understandably, I could still PXE boot and got my countdown for menu selection.
Installed SP1 for 9.6. No I get now PXE booting. Error message of No boot filename received.
Uninstalled the PXE representative and re-installed it.
Still the same error.
I have now done this 3 times with the same results each time.
How do I fix this? It should just be s simple SP install that should not break PXE services surely?
Rob