I have just bought all the components for a new build, my mobo which is an ASUS M5A 78L-M LX picks up everything except my SATA III 500gb Seagate HD. My CD-ROM can be recognized in every SATA 3 slot. I have tried the HD in every slot with and without the CD-ROM. I have also tried different sata cables none of which got the mobo to recognize it. I then tried the HD in a different PC an it picked it up fine.
I have tried multiple different configs with the SATA slots through BIOS, still no luck. Without it being recognized I can't load up an OS, I would really appreciate any advice and help,