Make sure that your firmware settings look for a bootable drive in the proper order. Your USB-connected drive(s) might be in the wrong place.
Your workstation CMOS settings (BIOS) can configure the order to search drives when trying to boot. Some systems have USB connected drives boot BEFORE they try to boot from internal hard-drives or optical-drives (DVD, CD, etc). This is because a USB key-drive has mostly replaced a diskette as a last resort boot device.
For my workstations, I search: optical, then hard-drives, then USB.
If I will be working with a USB boot, I'll adjust these settings until my work is completed.
Good luck,
~~~ 0;-Dan
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