Well, first ensure that the drive is connected (to the MOBO using the SATA cable & to the PSU using the power cable). Assuming that it's not a layer 1 issue, open up "disk management" (done by right-clicking "My computer" and selecting manage in win 7) and look at the file system. Maybe, you're currently using one that isn't supported by your OS. From there, format and you should be good.
Keep me posted!