NMI button
Table 11. NMI button
Button name Function
Force NMI
button
This button is on the rear of the server. Press this button to force a nonmaskable interrupt to the
processor. 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).
Light path button
Table 12. Light path button
Button name Function
Light path
button
Press this button to light the LEDs on the system board when the power source has been removed
from the server.
SW4
See the following table for SW4 switch block functions.
Table 13. System board SW4 switch block descriptions
Switch
number
Default position
Off On
1, 16
Off Host TPM Physical Presence disabled Host TPM Physical Presence enable
2, 15
Off PASSWORD_OVERRIDE function disabled PASSWORD_OVERRIDE function
enabled
3, 14
Off Serial port message from uEFI Serial port message from Lenovo
XClarity Controller
4, 13
Off XCC TPM Physical Presence disabled XCC TPM Physical Presence
enabled
5, 12
Off
Managing Engine recovery mode disabled Managing Engine set to recovery
mode
6, 11
Off
Managing Engine security override disabled Managing Engine security override
enabled
7, 10
Off Reserved
8, 9
Off Real time clock reset
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
http://thinksystem.lenovofiles.com/help/topic/
safety_documentation/pdf_files.html
, “Installation Guidelines” on page 107, “Handling static-sensitive
devices” on page 110, and “Power off the server” on page 12.
2. Any system board switch or jumper block that is not shown in the illustrations in this document are
reserved.
System board LEDs
See this section to locate the LEDs on the system board.
The following illustration shows the light emitting diodes (LEDs) on the system board.
Chapter 2. Server components 37
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