System-Board Leds - Lenovo System 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
Default position
Switch number
1 Off
2 Off
3
Off
4 Off
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.
Description
Reserved.
Reserved.
Reserved.
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 99 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
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