So, you are in AHCI mode correct? And on the Advanced BIOS page you cannot set HDD for the first entry in 1, 2, 3 boot order, and also cannot move your hard drive to the top of the list in the Hard Disk Boot Priority menu page at the top of Advanced BIOS page?
You have the Intel port enabled, and set to AHCI correct? It's the settings at the top of the Integrated Peripherals BIOS page. This is how you want it to look
Integrated Peripherals
eXtreme Hard Drive ........................ Disabled
XXX SATA Control Mode ..................... AHCI
SATA Port0-3 Native Mode ............. Either
If that is how you have it, please show us an image of that, and an image of 1, 2, 3 boot order options and an image of the hard disk boot priority options page.
Are these new drives? Have you tried other cables in case you have bad cables?