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#21
I suggest you detach all the other USB devices so that that BIOS boot menu will only show the one stick from which you want to boot. Usually it's easy - you navigate to the stick with the up/down keys and hit enter. There may be a little message appearing on the left top in the next (black) screen that says: "Hit any key" - that's when you hit the space bar (or any other) to proceed. You have 10 seconds to do that after which the BIOS resumes the boot from your default device (which is probably the C disk).