I've built a new system, and I want to take full advantage of UEFI and Ubuntu. So I install Ubuntu, and try to boot from it, and my BIOS (Asus EZ Mode / Advanced Mode) simply says "No bootable medium found. Insert Bootable Medium and press any key to try again." So I've reinstalled several times, without any failures, Ubuntu IS installed, and I've tried Ubuntu Boot Repair (link below) and nothing I do seems to work.
Asus f1a75m pro
AMD A8 APU
Samsung 1TB HDD
8GB G-Skill Ripjaws X (1866)
Partitions and Ubuntu Boot Repair