Check if you sata controllers are disable. some motherboard has 2 sata controllers.
Use the DVD power connector on your HDD to see if that work, if doesnt work can be your southbridge.
I've already tried different power connectors with the hdd and that didn't work. All the power connectors work because I tried each available one with the dvd drive.
And I don't think I have any options in the BIOS to enable/disable SATA controllers. I think this motherboard only has one SATA controller, but it works with the dvd drive.