I'm just saying here...But if your BIOS does not recognize the drive, could be serveral things. Are you sure it's spinning up? Maybe the drive is dead, open up your case and feel for vibrations if it's spinning. Double check your cables and reseat your connections. Alos, swap out the cables, could be the cables are bad. I doubt it, but maybe it's a motherboard driver issues? Maybe check the manufacture drivers for your motherboard.
In the BIOS, is the drive enabled? You may need enable the drive in the System Setup. Oh yeah, could be a jumper issue as well. You have to get the BIOS to see that drive. Goodluck.