The HP Compaq Elite 8300 all in one is part of a business class line. Depending on how the PC password is set, you might need some help from the IT dept of your company.
You should be able to enter the BIOS, if not password protected, by doing the following:
Start tapping the Esc key and then press the start button.
Keep tapping the Esc key until a popup menu shows. Then pick the BIOS Setup F10
https://support.hp.com/us-en/document/bph07110
You should then be able to set the boot order, to boot from the USB. If you cannot get that far because of the password, ask the IT dept to allow access, and have them remove the password requirement.
Here is a note in the manual about the security password
CAUTION:If you enable the stringent security feature in Computer Setup and you forget the setup password or the power-on password, the computer is inaccessible and can no longer be used.
I'm not an HP employee.
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