System-board switches

Use this information to locate and define system-board switches in the blade server.

The following illustration shows the location of the light path diagnostics switch on the system board.

The following table describes the function of each switch in the switch blocks (SW1, SW2, SW3).

Switch number	Description	Switch setting	Definition
SW1 - 1	Password override switch	Changing position of this switch resets the power on password.	This switch overrides the power on password. The system ships with this switch off, but it can be on or off in a functioning system.
SW1 - 2	Trusted Platform Module (TPM) physical presence	The default position is off.	Turning this switch to the on position indicates a physical presence to the TPM.
SW1 - 3	ICH9 RTC reset	Normally open. Toggle to reset RTC.	Resets the RTC. A momentary toggle is all that is required. To avoid excessive battery drain, do not leave this switch closed.
SW1 - 4	Boot using the backup IMM code.	The default position is off, allowing the blade server to boot from the primary IMM firmware.	When the switch is in the default off position, the blade server will boot using the primary IMM firmware. When the switch is on, the blade server will boot using a backup of the IMM firmware.
SW1 - 5	Boot block recovery	The default position is off, allowing the blade server to boot from the primary UEFI firmware.	When the switch is on it allows the blade server to boot using the backup UEFI.
SW1 - 6	IMM force update	The default position is off.	For trained service technician only.
SW1 - 7	Wake on LAN (WOL) disable	The default position is off.	Turning this switch to the on position disables WOL.
SW1 - 8	Force H8 update	The default position is off.	N/A
SW3	Light path diagnostics switch	The default position is off. Turning this switch on lights the light path diagnostic LEDs.	Push down on the light path diagnostics switch push button to light the diagnostic LEDs.