Do you know of any passwords to this computer?
If you haven't used any password in 2 years, I don't know why dropping it would cause a need for any password.
The password can be changed or deleted in the BIOS. However, The BIOS may also have a password.
Lacking the knowledge of any passwords on the computer, it is pretty much toast, since the passwords on a Lenova are typically stored in a chip on the MB. The only way to eliminate the password is to change the chip or motherbard.