IBM System x3800 Problem Determination And Service Manual page 179

If 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 Configuration/Setup Utility program and reset the
power-on password.
v Remove the battery from the server and then reinstall it. For instructions on
removing the battery, see "Removing the battery" on page 133.
v Change the position of the power-on password override jumper on the I/O board
to bypass the power-on password check.
Attention: Before changing any switch settings or moving any jumpers, turn off
the server; then, disconnect all power cords and external cables. See "Safety" on
page vii. Do not change settings or move jumpers on any system-board switch or
jumper blocks that are not shown in this document.
The following illustration shows the location of the power-on password override,
boot recovery, and Wake on LAN bypass jumpers.
SAS 1
SAS 2
System serial (COM 1)
SP serial (COM 2)
While the server is turned off, move the power-on password jumper from pins 1
and 2 to pins 2 and 3. You can then start the Configuration/Setup Utility program
and reset the power-on password. After you reset the password, turn off the
server again and move the jumper back to pins 1 and 2.
The power-on password override switch does not affect the administrator
password.
Administrator password: If an administrator password is set, you must type the
administrator password for access to the full Configuration/Setup Utility menu. You
can use any combination of up to seven characters (A–Z, a–z, and 0–9) for the
password. The Administrator Password choice is on the Configuration/Setup
Utility menu only if an optional IBM Remote Supervisor Adapter II SlimLine is
installed.
Attention: If you set an administrator password and then forget it, there is no way
to change, override, or remove it. You must replace the I/O board.
Remote Supervisor Adapter II SlimLine
Media devices
Light path diagnostic
1 2 3
1 2 3
1 2 3
Chapter 5. Configuration information and instructions
Power-on password
override
Boot recovery
Wake-on-LAN
bypass
Front USB
Battery
Default jumper
position
163