System-board LEDs
The following illustration shows the light-emitting diodes (LEDs) on the system
board.
DIMM 1
DIMM 2
DIMM 3
DIMM 4
Microprocessor
IMM2 hearbeat
LED
RTMM
Hearbeat LED
DIMM 1 - 4
error LEDs
Microprocessor
error LED
Standby power
LED
System board
error LED
Note: When you disconnect the power source from the server, you lose the ability
to view the LEDs because the LEDs are not lit when the power source is
removed. Before you disconnect the power source, make a note of which
LEDs are lit, including the LEDs that are lit on the operation information
panel and LEDs inside the server on the system board.
Table 3. System-board LEDs
LED Description
Standby power LED When this LED is lit, it indicates that the server is connected
to ac power.
DIMM error LEDs A memory DIMM has failed or is incorrectly installed.
Microprocessor error LED Microprocessor has failed, is missing, or has been incorrectly
installed.
System-board error LED System-board CPU VRD and/or power voltage regulators
have failed.
IMM2 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.
RTMM heartbeat LED power-on and power-off sequencing.
24 IBM System x3250 M4 Type 2583: Installation and User’s Guide
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