Imaging Job doesn't start after PXE Boot

Thanks for helping all. After I send an imaging job to a machine it will boot into PXE but doesn't appear to get the job sent. It will just keep flashing:

Altiris pre-select automation processing

UD 10.145.16.40

Altiris in x86pc preboot PXE 2.x

Build ID=402

I've had this before at one of my other sites and just regerated PXE config on the site server and it worked as normal. This time however I still get the same thing. Any ideas please? Using 7.1.

Thank you!