Hi there,
Have you tried to swap keys when typing your HDD-password ? I mean, where I live sometimes people use Qwerty, azerty or qwertzu-keyboards. and usually the correct keyboard is only loaded when windows (or other OS) is running. But the BIOS usually knows only one keyboard : Qwerty or UK/US.
try putting in your HDD-password with the a and z switched with q and w respecting this order. Also the m is next to the n on a qwerty !
Let us know if this is enough !
Kind regards,
Louise.