System-Board Leds And Controls - Lenovo NeXtScale nx360 M5 Installation And Service Manual

Table 2. System board jumpers
Jumper name
Clear CMOS jumper
UEFI boot recovery jumper
Notes:
1. If no jumper is present, the server responds as if the pins are set to the default.
2. Changing the position of the UEFI boot backup jumper (JP2) from pins 1 and 2 to pins 2 and 3 before the server
is turned on alters which flash ROM page is loaded. Do not change the jumper pin position after the server is
turned on. This can cause an unpredictable problem.

System-board LEDs and controls

The following illustration shows the light-emitting diodes (LEDs) on the system board.
Any error LED can be lit after ac power has been removed from the system-board tray so that you can
isolate a problem. After ac power has been removed from the system-board tray, power remains available
to these LEDs for up to 90 seconds. To view the error LEDs, press and hold the light path button on the
system board to light the error LEDs. The error LEDs that were lit while the system-board tray was running
will be lit again while the button is pressed.
The following illustration shows the LEDs and controls on the system board.
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Lenovo NeXtScale nx360 M5 Installation and Service Guide
Jumper setting
• Pins 1 and 2: Normal (default).
• Pins 2 and 3: Clears the real-time clock (RTC) registry.
• Pins 1 and 2: Normal (default). Boots from the primary page.
• Pins 2 and 3: Boots from the secondary (backup) page.