“Safety” on page vii, “Installation guidelines” on page 35, “Handling
static-sensitive devices” on page 37, and “Turning off the server” on page 24.)
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.
Note: Error LEDs remain lit only while the server is connected to power. If you
disconnect power to the server, you can press and hold the light path diagnostics
button to light the error LEDs on the system board.
LED name Description
Error LEDs When an error LED is lit, it indicates that the associated
component has failed.
RTMM heartbeat LED Power-on and power-off sequencing.
IMM 2 heartbeat LED Indicates the status of the boot process of the IMM2.
When the server is connected to power this LED flashes quickly
to indicate that the IMM2 code is loading. When the loading is
complete, the LED stops flashing briefly and then flashes slowly
to indicate that the IMM2 if fully operational and you can press
the power-control button to start the server.
Standby power LED When this LED is flashing, it indicates that the server is
connected to an ac power source.
When this LED is lit, it indicates that the server is dc power on.
System board error LED System-board has failed.
Microprocessor
mismatch LED
When this LED is lit, it indicates that microprocessor 1 is not
installed, or the microprocessors do not have the same cache
size and type, and clock speed.
DIMM error LEDs A memory DIMM has failed or is incorrectly installed.
Chapter 2. Installing optional devices 31
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