Component identification 15
Optional serial port connector
System maintenance switch
S1*
Off = iLO 4 security is enabled.
On = iLO 4 security is disabled.
S2
Off = System configuration can be
changed.
On = System configuration is locked.
S5*
Off = Power-on password is enabled.
On = Power-on password is disabled.
S6* **
On = Restore default manufacturing
settings
S7
Off = Set default boot mode to UEFI.
On = Set default boot mode to legacy.
*You can access the redundant ROM by setting S1, S5, and S6 to On.
**When the system maintenance switch position 6 is set to the On position, the system is prepared to restore all
configuration settings to their manufacturing defaults.
When the system maintenance switch position 6 is set to the On position and Secure Boot is enabled, some
configurations cannot be restored. For more information, see Secure Boot configuration (on page 127).
IMPORTANT:
Before using the S7 switch to change to Legacy BIOS Boot Mode, be sure the
HPE Dynamic Smart Array B140i Controller is disabled. Do not use the B140i controller when
the server is in Legacy BIOS Boot Mode.
NMI jumper
The NMI jumper allows administrators to perform a memory dump before performing a hard reset. Crash
dump analysis is an essential part of eliminating reliability problems, such as hangs or crashes in OSs,
device drivers, and applications. Many crashes can freeze a system, requiring you to do a hard reset.
Resetting the system erases any information that would support root cause analysis.
Systems running Microsoft® Windows® experience a blue-screen trap when the OS crashes. When this
happens, Microsoft® recommends that system administrators perform an NMI event by temporarily
shorting the NMI header with a jumper. The NMI event enables a hung system to become responsive
again.
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