Linux Lite Persistent USB Purchase

[Valtam]

To start with, all LL USB Persistent drives are tested before Shipping and a txt file is added to the Desktop and dated as proof. So it won't be the USB drive at fault here.
You can try: changing boot order from the BIOS, enabling/disabling UEFI, changing boot order at boot (usually F9 differs per brand), USB boot drive may appears with a benign name such as 'ubuntu' or similar - try booting every device that gets listed in your boot menus, try booting on a more modern pc. Don't attempt to alter the USB device in any way, that will render it unbootable! It will work, it just takes knowledge of how to boot devices.