Table 3. standard I/O book board SW1 switch block descriptions
Switch number
Default position Description
1
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 128 for additional
information about passwords.
2
Off Reserved
3
Off Reserved
4
Off Reserved
5
Off Reserved
6
Off Reserved
7
Off Force UEFI backup bank. Changing the position
of the switch to ON will force the system to boot
from the backup UEFI bank.
Important:
1. Before you change any switch settings or move any jumpers, turn off the server; then, disconnect all
power cords and external cables. Review the information in “Safety” on page v, “Installation guidelines”
on page 44, “Handling static-sensitive devices” on page 46, and “Turning off the server” on page 40.
2. Any standard I/O book board switch or jumper blocks that are not shown in the illustrations in this
document are reserved.
The following table describes the functions of the button on the standard I/O book board:
Table 4. Button on the standard I/O bookserver
Button name Function
NMI button
This button is on the rear of the standard I/O book. 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).
Server power features
This topic provides an overview of the server power features.
When the server is connected to a suitable input power source but is not turned on, the operating system
does not run, and all core logic except for the service processor (the integrated management module) is shut
Chapter 1. The Lenovo System x3850 X6 and x3950 X6 Type 6241 server 39
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