Hi there lisaamys,
Sorry that you are facing some issues with your WD drive.
In my view, there are two possibilities:
1st one: There is something wrong with the drive. Is the drive recognized by Disk Management and Device Manager? You can start with something simple as just changing the USB cable. In case the issue persists, you can try the drive on another system(in case the drive is recognized just fine over there you need to back up the data stored on it until you sort this out). This way you which of the two(system or drive) is causing the troubles.
2nd one: There is something wrong with the USB ports. Are they USB 2.0 or USB 3.0? It may be a good idea to start with reinstalling your USB 2.0/3.0 drivers. You can find them on your MOBO's website. Another thing you can try is to connect the drive to the ports on the back of the computer case.
If your drive is recognized by Disk Management, you can try testing it with WD's Data Lifeguard Diagnostic tool:
http://products.wdc.com/support/kb.ashx?id=4KWUAa
Let me know how this goes,
D_Know_WD