Figure 19. Switches, jumpers and buttons
1 “NMI button” on page 39
3 “SW4” on page 39
2 “Light path button” on page 39
NMI button
Table 14. 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 15. 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 16. 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
Chapter 2. Server components 39
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