I finally found a solution.
Thanks for GhislainG! It belongs the "Hard Drive Group". The USB that I originally used was a SD inside a multicard reader. It can be recongized and boot from all other computer. However, the MS-7613 motherboard doesn't recongized it as a bootable USB. As soon as I used a REAL USB flash, MS-7613 saw it in the "Hard Drive Group" and booted from it.
Thank you very one! Your suggestions are appreciated!