Lenovo 3797 manual System-board LEDs, Describes the function of each switch on the switch block

Table 4. Callout descriptions (continued)

Notes:

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.

Table 5 describes the function of each switch on the switch block.

Table 5. Switch block 3, switches 1 - 8

Switch		Switch
number	Default value	description
8	Off	Reserved.
7	Off	Reserved.
6	Off	Reserved.
5	Off	Power-on password override. Changing the position of this switch 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. You do not have to
		move the switch back to the default position after the password is overridden.
		Changing the position of this switch does not affect the administrator password check
		if an administrator password is set.
		See “Passwords” on page 107 for additional information about the power-on
		password.
4	Off	Reserved.
3	Off	Reserved.
2	Off	Reserved.
1	Off	Reserved.Clear

Clear CMOS. When this switch is toggled to On, it clears the CMOS data, which clears the power-on password.

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” on page vii, “Installation guidelines” on page 33, “Handling static-sensitive devices” on page 35, and “Turning off the server” on page 31.)

2.Any system-board switch or jumper blocks that are not shown in the illustrations in this document are reserved.

System-board LEDs

The following illustration shows the light-emitting diodes (LEDs) on the system board.

Chapter 4. Server controls, LEDs, and power 27