HP EliteDesk 705 G2 MT Will not boot to a USB HDD!

[CPCothran]

I am trying to image a lot of MT's with windows 10. i have only had one successfully boot to an HDD so far which is a problem because i have 800 to do...I know for a fact that the image i am using is good because we are imaging HP Pro books with the same HDD's with out an issue. i have tried everything, from turning off secure boot, installing brand new HDD's, disabling TPM, like literally everything. Even updated the BIOS from 2.16 to the current 2.19. 

What happens is, every time i select the USB bootable media in the Boot menu, the screen will go black, it will beep and take me right back to the boot menu.

I have cleared the BIOS passwords to ensure authentication wasn't an issue. i have also made sure the PC HDD wasn't locked with the HDD utility tool within the BIOS. I am literally stomped and sitting on 500k worth of bricks if i cant get this to work.

Before anyone assumes i have other options besides the USB, i don't. I am not allowed to clone. the image is 26GB so Disks aren't really an option.  

Any ideas you may have will be extremly apprecitated, please help me!

[SDH]

This is a User <-> User forum, not a HP <-> User channel of communication.

With 800 to do you really deserve direct communication with HP.  

Things that I can do with USB2 and USB3 drives (USB HDD and USB thumb drives) attached via USB2 port I cannot do with USB2 or USB3 drives attached via USB 3 port.  I'm hoping you have some or even just 1 USB2 port to experiment with.  The convention is that the USB2 ones have black or dark brown plastic inside, while the USB3 ports have blue plastic inside.

Edit:  The HP datasheet for your hardware, HERE , indicates there are both front and rear USB2 and USB3 ports.  Those on the rear backplane have been considered in some PCs to be better because they are hard-wired to the motherboard have provided better performance/higher power capabilities.  With HP hardware, however, that probably is not the case.  In HP BIOS for some of my workstations the choice of bootable USB devices can be confusing.  Make sure you check in BIOS to have the USB options not grayed out under the bootable devices area, and that area of BIOS may have USB floppy, USB CD, and USB drive in different areas meaning different things.  The terminology varies in HP BIOS somewhat, so the technical and service manuals should help with that.  I personally run BIOS in legacy mode, too, if that is available.