You're welcome. And welcome to the forum!
That points directly to the hard drive itself then. If the BIOS cannot see it Windows likely won't be able to either (or any OS for that matter - at least on that machine).
Some BIOS's have a separate screen for doing diagnostics on hard drives. You might try checking for that.
Hearing/feeling the motor spinning is a good sign, but that alone doesn't mean it's all working right.
You can try WD's diagnosics app. Probably best is to burn a cd with this: WD Support / Downloads / SATA & SAS / WD RE2
If you can't burn you can download the Windows version: WD Support / Downloads / SATA & SAS / WD RE2
Don't worry that the product page doesn't match your model, they use the same app for most of their models.
Do you have another machine that you can connect it to?
Can you take a picture of the BIOS screen where the drive should appear, and then upload that as a screenshot?
Let us know the computer model number (or motherboard).