|There are a number of company's that offer a fix to your problem.|
But the cost can be more than a new hd and no guarantee that any info on the disk can be saved.
I would suggest a look at Hirans boot cd....(free) as it has atapwd on it.
Still no guarantee of saving any info.
Your computer will need a cdrom drive.
If you never had a password on the hd....the problem may come about by a bad chip on the hd ...hmmmm