Hi there jd71,
You should really provide some more information on the issue you are facing.
Are you using some sort of a third party enclosure? (if not, what is the model of the external device?)
Is the drive recognized by Disk Management? Is there any important data stored on the drive?
Something simple you can start with is to just attach the device with a different USB cable. Is the drive even powering up?
Let me know how this goes,
D_Know_WD