Lenovo B450 Notebook - Manual (Page 35)

Chapter 2. Learning the basics
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Using passwords
Using passwords helps prevent your computer from being used by others.
Once you set a password and enable it, a prompt appears on the screen
each time you power on the computer. Enter your password at the prompt.
The computer cannot be used unless you enter the correct password.
For details about how to set the password, see the help to the right of the
screen in BIOS setup utility.
Note: This password can be from one to seven alphanumeric characters in any
combination.
Note: To enter BIOS setup utility, press F2 when the Lenovo logo appears on the
screen while the computer is starting up.