Internal hard disk error

Hello, I am currently having issues with booting up, I have bought two brand new hard drives to test if one of them was bad but they both do the same thing. When I boot up it gives me the error "Internal hard disk drive not found, to solve reseat the drive . No bootable devices" I have tried 3 different cables made sure they were all pluged in and still got the same issue. Im my bios boot options I select hqrd disk as my 1st boot but it dosent say whick hard drive, usually it says "Hard Drive: (Model Number)". But then when i select legacy mode it tells me that it will boot from Hard Disk: ST2000 and then I'll go save and exit, and it will boot to my windows 8.1 cd. I have tried re-setting the pc and that worked for about 5 minutes and then it game me a black screen. And the reason I thought it was my hdd is because when I would so the ePSA pre boot it would give me an error on the hard drive, but I have just redone the ePSA and everything past. I can also see my hard drive connected through bios under SATA Port1. So I am completly lost on what to to. Thanks.

My pc specs:

I7-5820k

Amd r9 370

16gig ram

Seagate barracuda