Hp elite 8300 help

I’m attempting to install Mac OS Sierra on my 8300. The only issue I’ve ran into so far, is not being able to, no matter what, boot from the usb. I’ve tried ports, drives, deleting windows and formatting my SSD entirely. Nothing works. No settings in the bios. Nothing. I’m completely stumped and I don’t get it. I just get the following message:

“non system disk or disk error replace and strike any key when ready”

Options from bios: Boot order set to usb hard drive (obviously) on both legacy and UEFI options. Disabled every other boot option except hard drive. Secure boot off Legacy support on Fast boot off Serial port disabled AHCI enabled

Any help greatly appreciated.

submitted by /u/grey200s
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