What port do you have it connected to, and is that controller enabled in the BIOS?
If the controller is enabled you should see the disk in disk management or device manager no matter what, so it may be a DOA disk if you do have the controller enabled.
The disk wont show up in your my computer until you initialize it in disk management, and assign it a drive letter, but you should see it in the above mentioned things no matter what as long as that motherboard controller is enabled.