System-board switches, jumpers, and buttons
The following illustration shows the location of the switches, jumpers, and buttons on the server.
- 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.
- Any system-board switch or jumper block that is not shown in the illustrations in this document are reserved.
- 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 jumpers on the system board.
|Jumper number||Jumper name||Jumper setting|
|JP1||CMOS clear jumper|
|JP2||UEFI boot backup jumper|
|JP6||System TPM physical presence jumper|
|Switch number||Default position||Description|
|4||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 power-on password in overridden.|
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.
The following table describes the functions of the button on the system board.
|Force NMI button||This button is on the rear of the server. Press this button to force a nonmaskable interrupt to the microprocessor. You might have to use a pen or the end of a straightened paper clip to press the button. You can also use it to force a blue-screen memory dump (use this button only when you are directed to do so by Lenovo Support).|