I posted before about a couple questions I had but I have some new ones. My cousin gave me his gaming PC but told be he took out the hard drive and that I would have to get a new one, my WD 1tb blue arrived recently, I put it in its slot and found out there were 2 cables unplugged near the hardrive ports. They both matched perfectly into my hardrive so im guessing thats where my cousin unplugged his HD and left the cables. The problem is when I look at my mobo the only SATA cable is connected somewhere else in the computer and the black cable I plugged into the hardrive (says ATA or something on it) is no where to be found on the motherboard, that I can see at least. How do I know if the hardrive is working? I also need a operating system, going to be getting windows 8 soon, when I plug in my monitor and turn on the computer it says: reboot and select proper boot device or insert boot media in selected boot device and press a key... what does this mean? Can someone help me thanks.