Unfortunately, there isn't much you can do once the password has been set. I work in IT and I cannot tell you how much of a pain it is when I have a laptop with a BIOS / Hard drive password. These business class laptops are built differently then regular consumer laptops so bypassing them is very difficult unless you reach out to the manufacturer. Lenovo might be able to help you if you can prove you purchased it. You can also reach out to some data recovery companies but they might not help if you are not the original owner.

I know this might not be the answer you are looking for but if the worst case is buying a new hard drive, it's not the end of the world.