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System-board jumpers and buttons

The illustration in this section shows the location of the jumpers and buttons on the server.

Note
If there is a clear protective sticker on the top of the switch blocks, you must remove and discard it to access the switches.
Figure 1. System-board jumpers and buttons
System-board jumpers and buttons

The following table describes the jumpers and buttons on the system board.

Table 1. System-board jumpers and buttons
Jumper and button nameJumper setting / Button function
1 Power permission override jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Override the power-on permission.
2 Force Lenovo XClarity Controller update jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Force the Lenovo XClarity Controller to update to the latest version.
3 Clear CMOS jumper
  • Pins 1 and 2: Normal (default).
  • Pins 2 and 3: Clear the real-time clock (RTC) registry.
4 Force NMI buttonThis 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).
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 Information page, Installation guidelines, Handling static-sensitive devices, and Power off the server.
  2. Any system-board switch or jumper block that is not shown in the illustrations in this document are reserved.