IBM x3550 Problem Determination And Service Manual page 34

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IBM System x3550 Type 7978 and 1913: Problem Determination and Service Guide
Table 3. System-board LEDs
LED
Error LEDs
BMC status LED
Standby power LED
12-volt power (A, B, C, D)
LEDs
Location LED
System-error LED
Description
The associated component has failed.
This LED flashes to indicate that the BMC (baseboard
management controller) is functioning normally.
When this LED is lit and not flashing, it indicates that the
server is turned on. When this LED is flashing, it indicates
that the server is turned off and still connected to an ac
power source. When this LED is off, it indicates that ac
power is not present, or the power supply or the LED itself
has failed.
If any of these LEDs is lit, there is a failure in the associated
system board power bus (see "Power problems" on page
132).
Use this LED to visually locate the server among other
servers. You can use IBM Director to light this LED remotely.
When this LED is lit, it indicates that a system error has
occurred. An LED on the light path diagnostics panel is also
lit to help isolate the error.