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System-board switches and 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
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.

The following table describes the functions of the SW4 switch block on the system board.

Table 1. System board SW4 switch block definition.

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

Switch numberSwitch nameDefault positionDescription
1UEFI boot backupOff

When this switch is off, the primary firmware ROM page is loaded. When this switch is on, the secondary (backup) firmware ROM page is loaded.

Note
Changing the position of the UEFI boot back switch before the server is turned on alters which flash ROM page is loaded. Do not move the switch after the server is turned on. This can cause an unpredictable problem.
2System TPM physical presenceOff

Indicates a physical presence to the system TPM when on.

3Power-on password overrideOff

Bypasses the power-on password check the next time the server is turned on and starts the Setup utility so that you can change or delete the power-on password when on.

Note
  1. You do not have to move the switch back to the default position after the power-on password in overridden.
  2. Changing the position of this switch does not affect the administrator password check if an administrator password is set. See Passwords for additional information about passwords.
4CMOS clearOff

Clears CMOS memory when on.

Note
  1. Before you change any switch settings or move any jumpers, turn off the server. Review the information in Safety, Installation guidelines, Handling static-sensitive devices, 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.