Missing MBR ?

[Joseph Marah]

All of a sudden my MBR prompt has disapeared and replaced by the following:
   
  Intel(R) Boot Agent FEv4.1.17
  Copyright (C) 1997-2004, Intel Corporation
  Intel(R) BootAgent PXE Base Code (PXE-2.1 buildbuild 085)
  Copyright (C) 1997-2004, Intel Corporation
  Client MAC addr .............)  GUID.......
  PXE-E53:No boot filename received
  PXE-M)F:Exiting Intel Boot Agent.
   
  It then hangs indefinitely.
   
  I suspect there is some setting that has made my i386 FreeeBSD 6.2 boot process default to this but can't lay my hands on it.  I have tried Sysinstall to restore the master boot record from the menu but it still boots with the Intel Boot Agent.  I am new and heve no idea how to use FIXIT.  Please help.
   
  Thanks
  Joseph