Depending on the hardware manufacturer, you will be required to enter the BIOS of the machine to boot to UEFI Mode or Legacy BIOS mode.
You may reference article that explains booting into UEFI mode or legacy BIOS-compatibility mode when installing Windows from your USB, DVD, or network location: http://technet.microsoft.com/en-us/library/hh825112.aspx
On some systems where you will be able to boot from USB onto UEFI systems when the BIOS options is set to boot with UEFI enabled.
However, in this particular situation where the BIOS is not recognizing the USB, then the manufacturer requires booting the BIOS with "UEFI with the Legacy option" enabled. And even this required that the Legacy boot option be enabled as well as the UEFI boot option be disabled. But you will need to first disable the "Secure Boot" option before being able to enable the "Load Legacy Option Rom" and set the "Boot List Option" to UEFI. Only then will having the legacy boot option enabled, will then the USB storage device appear as an option to boot from under the UEFI boot menu.