Hi,
There was no message, just a blank screen with a blinking cursor.
I have found out the solution, however. The MBR on a stock USB drive is either corrupt or incompatible when creating a bootable USB drive through LDMS. The solution was to put the drive into a Linux OS, and use the partition manager to remove all partitions and reformat it as a FAT32 partition. Then I re-created the bootable USB drive through the LANDesk Boot Media Creator. This solved and made the USB drive boot any and all devices we need to image.
Thanks for your reply!