On the previous post, I used the YUMI tool to prepare a bootable linux usb disk. On my tests, I had some difficulties configuring my motherboard (Asus M5A99X EVO) to boot from usb. Here is what I did that worked:
After accessing the BIOS, on the Boot tab, there is a header called Boot Options Priorities. You should put the usb drive you want to boot on Boot Option #1. Additionally, on Hard Drive BBS Priorities, you should do the same. There is another header below (Boot Override), that should help if your pen drive is listed there amongst the options.
After setting these options, I was able to boot the pen drives configures by YUMI pretty reliably.