As above, remove all other drives, memory cards, printers etc. Method #2 – If you are not prompted with this type of message, you should be prompted to do a certain combination of keys to select a device to boot from:
Press any key to boot from an external media, if you are prompted to do so. It’s recommended that you remove all other drives, memory cards, printers, scanners etc. 
Method #1 – Follow these steps to boot from a USB:
on certain computer models (mostly ultrabooks) with a fast boot option, you’ll need to disable fast boot before you can boot from a USB. For more information, go to To access BIOS/UEFI 
the USB flash drive is prioritized in the Boot devices menu of your BIOS/UEFI panel. In order for your computer to boot from a USB flash drive, you need to make sure that:
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