I am having problems getting a couple models of computers to image. The first model (Dell Optiplex 740 with a Broadcom NIC) obtains an IP and allows me to hold the ctrl + alt keys to get the menu. I choose Maintenance Mode and I get a quick flash of the blue bar across the top, but then it goes and way and stops at a flashing cursor right below - Downloading config file "cmds\z_auto.cmd"

I am running 7 SP 1 with IR4 HP4 and the August 25 patch for drivers.

The second model (HP Pro 3000 SFF with a Realtek PCIe GBE NIC) won't even allow me into the menu when holding ctrl + alt.