When I attempt to boot the newly built computer from a USB flash drive in order to install windows 10, I get the error "Reboot and select proper boot device." I think that somehow my settings in the UEFI are not correct so that it is not attempting to boot from the USB flash drive as I'd like.

Some details:

* Motherboard is a Gigabyte GA-H81M-HD3
* I created the bootable USB flash drive from an ISO file on a Mac, using the Terminal & this method <https://www.youtube.com/watch?v=Nhgjqbq_zYA>
* This question is similar to mine, but doesn't seem to have a solution I can try, as I do not have a windows machine. I'd really like to solve this with the machines I have at hand if at all possible. [Can't install OS with bootable USB — Reboot and select proper boot device](https://superuser.com/questions/778648/cant-install-os-with-bootable-usb-reboot-and-select-proper-boot-device) [edited to add- I have a MacBook Air running Yosemite 10.10.5 & a new PC that is the focus of this question, which doesn't yet have an OS.]