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System-board jumpers

The following illustration shows the location and description of the switches and jumpers.

Figure 1. Location and description of switches and jumpers
Location and description of switches and jumpers

The following table describes the jumper on the system board.

Table 1. System board jumpers
Jumper numberJumper nameJumper setting
CN14Clear CMOS jumper
  • Pins 1 and 2: Normal (default) This keeps the CMOS data.
  • Pins 2 and 3: This clears the CMOS data such as power-on password and loads the default UEFI settings.
J2UEFI boot recovery jumper
  • Pins 1 and 2: Normal (default) Loads the primary server firmware ROM page.
  • Pins 2 and 3: Loads the secondary (backup) server firmware ROM page.
  1. If no jumper is present, the server responds as if the pins are set to 1 and 2.
  2. Changing the position of the UEFI boot recovery jumper 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.


  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, Installation guidelines, Handling static-sensitive devices, and Turning off the server.
  2. Any system-board switch or jumper blocks that are not shown in the illustrations in this document are reserved.