Hp elite 8300 sff wont boot from usb flash drive, there is no option in the BIOS to select the USB stick, also when press f9, not showing there,
*Enabling and disabling UEFI boot sources
* USB hard drive to top of boot list
* Network adapter to bottom
* Factory default settings,
Any suggestions please, cannot be a BIOS upgrade as the USB build stick, takes care of that.