As advised, I have tried (1) using my HD on two other computers, and (2) using a brand new cable. Both solutions do not work. I am still getting the "Invalid Password" message. in the meantime, I have received a message from WD telling me that since I have "forgotten my password", there is no way but to reformat the drive and lose all my information and documents. That is unacceptable. To me, the drive is not heavily used (it is only used daily for document storage), it has not been dropped or used in a untoward manner. It seems therefore to me that is is a WD Smartware software fault.
Again, I reiterate that I have not changed my password, and I had been using it since I have had the HD. All of a sudden the HD just refused to accept the same password I have been using. Please let me know how I can bypass the WD Smartware program and kill the password function. I am sure there is a way.