When you say 'No BIOS" I am assuming that you have tried these two HDDs in several machines and they are not recognised by any of them. Am I correct?
If that is the case it would appear that the controllers on the disks have probably gone belly up and you are in a bit of a pickle! If you have another identical disk drive, and I mean absolutely identical to one of them, you may be able to change the circuit board over and get lucky, but that is a real long shot.
Probably you are faced with taking the disks to those people who can extract data byte by byte from failed HDDs, but they do charge for the priviledge.
If I am wrong and you have only tried the HDDs in one computer, then clearly have a go with another system and see what goes, but I feel you have already done that.
Sorry I can't be of more assistance