System-board switches and jumpers

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

  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, and Turning off the server.
  2. Any system-board switch or jumper block that is not shown in the illustrations in this document are reserved.
  3. If there is a clear protective sticker on the switch blocks, you must remove and discard it to access the switches.
Figure 1. Location of the switches, jumpers, and buttons on the system board
Location of the switches, jumpers, and buttons on the system board

The following table describes the jumpers on the system board.

Table 1. Jumpers definition.

The jumper description table with one level of row and column headers.

Jumper name Description
Clear CMOS jumper
  • Pins 1 and 2: Keep CMOS data (default)
  • Pins 2 and 3: Clear CMOS data
UEFI boot backup jumper
  • Pins 1 and 2: Normal (default). Loads the primary server firmware ROM page.
  • Pins 2 and 3: Boot from backup. Loads the secondary (backup) server firmware ROM page.
  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 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.