Caviar Green WD20EARX 2 TB not recognized by Win 7-64

Just got a new WD20EARX and dropped it into my system.  Opened Windows Explorer, but the drive was nowhere to be seen.

Tried different power and SATA connections (both of which are known as working) and still got nothing.  Dropped the drive into an external enclosure and connected it via USB 2.0 on two different computers (my desktop and a Vista laptop)  I got the same little message popup on each machine that said device drivers were being installed, then the message saying the device was ready to use.  Checked Windows Explorer and the same thing happened; the drive isn’t being recognized.

System specs:

OS: Microsoft Windows 7 Professional 64-bit
Mobo: MSI 890FXA-GD65 AM3
Proc: AMD Phenom II X4 965 Black Edition Deneb 3.4GHz
Video: MSI R6850 Cyclone PE Radeon 1GB 256-bit GDDR5
RAM: Patriot Signature 8GB (2 x 4GB) DDR3 1600 (PC3 12800)
Audio: Creative SB X-Fi Xtreme Audio 70SB104000000

Thanks in advance for any help/suggestions!