Lenovo THINKSERVER 3821 - Manual (Page 264)

password has access to only the limited Setup Utility menu; the user can set,
change, and delete the power-on password, if the system administrator has given
the user that authority.
Power-on password
If a power-on password is set, when you turn on the server, the system startup will
not be completed until you type the power-on password. You can use any
combination of up to seven characters (A - Z, a - z, and 0 - 9) for the password.
When a power-on password is set, you can enable the Unattended Start mode, in
which the keyboard and mouse remain locked but the operating system can start.
You can unlock the keyboard and mouse by typing the power-on password.
If you forget the power-on password, you can regain access to the server in any of
the following ways:
v If an administrator password is set, type the administrator password at the
password prompt. Start the Setup Utility and reset the power-on password.
v Remove the battery from the server and then reinstall it. See “Removing the
battery” on page 172 for instructions for removing the battery.
256 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual