System-Board Leds - Lenovo x3550 M4 Installation And Service Manual

The following table describes the functions of the SW3 switch block on the system
board.
Table 3. System board SW3 switch block definition
Switch
number
1
2
3
4
The following table describes the functions of the button on the system board.
Table 4. Button on the server
Button name
Force NMI button

System-board LEDs

The following illustration shows the light-emitting diodes (LEDs) on the system
board.
Default position Description
Off Reserved.
Off Reserved.
Off Reserved.
Off Power-on password override. Changing the
position of this switch bypasses the power-on
password check the next time the server is turned
on and starts the Setup utility so that you can
change or delete the power-on password. You do
not have to move the switch back to the default
position after the power-on password in
overridden.
Changing the position of this switch does not affect
the administrator password check if an
administrator password is set.
See "Passwords" on page 106 for additional
information about passwords.
Function
This button is on the rear of the server. Press
this button to force a nonmaskable interrupt
to the microprocessor. You might have to use
a pen or the end of a straightened paper clip
to press the button. You can also use it to
force a blue-screen memory dump (use this
button only when you are directed to do so
by Lenovo Support).
Chapter 2. Installing optional devices
31