IBM x3550 - System - 7978, Problem Determination And Service Manual

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Table 3. System-board LEDs
LED Description
Error LEDs The associated component has failed.
BMC status LED This LED flashes to indicate that the BMC (baseboard
management controller) is functioning normally.
Standby power LED 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.
12-volt power (A, B, C, D)
LEDs If any of these LEDs is lit, there is a failure in the associated
system board power bus (see “Power problems” on page
132).
Location LED Use this LED to visually locate the server among other
servers. You can use IBM Director to light this LED remotely.
System-error LED 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.
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IBM System x3550 Type 7978 and 1913: Problem Determination and Service Guide