The new HD has nothing on it. It's new out of the box, straight from Computer Geeks. The new (troubled) HD is a 500GB; the existing one is a 250GB; both WD.
I'm not sure if there's anything else that needs to be done other than connect the power and data lines to the new HD. It should have been a plug n' play kinda thing. The fact that it shows up at all on Disk Manager leads me to believe it's at least being recognized by the computer, even though I can't seem to format it.
Strange, eh?