Ok, I have built many computers, and this is the first time this has happened to me. I built a computer for a friend, all new parts, and for some reason, the computer will not detect the hard drive at all. At first, it would not detect the dvd drive either .. but after trying it several times, changing sata cables and different connectors on the mobo, it finally detected the DVD drive. I tried similar methods to get the HDD to be detected by bios, but it will not. The bios says there is no device connected no matter where I plug it in. Both devices definately have power, and are securely connected. The motherboard is a MSI NF750 G55 and the HDD is a Seagate Barracuda 320 gb. Any ideas??