E4300 - BIOS A14 - PXE E74 Error

We use LANDESK to image our laptops and desktops when they arrive on site. Previously these have arrived with the A13 BIOS with Intel Boot Agent V1.3.39 and PXE 2.1 build 087. We could use PXE to build these laptops with no problems...

The other day we recieved laptops with the A14 BIOS, these have an updated PXE (Build 088). Whenever we try to boot these laptops through PXE we get an PXE-E74 bad or missing pxe menu and or prompt information error. We have tested out PXE representative with various other laptops and they work fine.

We have been on to LANDESK, who, in their ever helpful way, have washed their hands of this problem and said its Dell's issue.... So this is why I am posting this. Has anyone else had problems building through PXE with the new A14 BIOS for the E4300?

Any help would be appreciated. We have a temporary workaround for the time being, but we need to get this sorted ASAP.