Notwithstanding "barry's" cryptic comment, I would guess that Ron's
recommendation is correct. It's a very common occurrence among users who
purchase a brand-new hard drive, install it in their computer, and then
wonder why it's not "seen" by the system.
Understand that if you've connected/configured the drive properly, as
apparently you have, the disk *will* be recognized by your motherboard's
BIOS and even in Device Manager. But that does not mean that the operating
system will recognize it. As Ron points out you must partition & format that
drive before it is usable.
And forget about the fact that it doesn't "come up as an icon". After you've
partitioned/formatted the drive, check in My Computer and/or Windows
Explorer to ensure the drive is recognized.
Now, having said all that -- if you *have* correctly
connected/configured/partitioned/formatted the disk and it still isn't being
recognized by the OS, that's a different problem...