operation, both the ac and dc power LEDs are lit. For any other combination of
LEDs, see “Power-supply LEDs” on page 29.
v IN OK power LED: Each hot-swap dc power supply has an IN OK power LED
and an OUT OK power LED. When the IN OK power LED is lit, it indicates that
sufficient power is coming into the power supply through the power cord.
During typical operation, both the IN OK and OUT OK power LEDs are lit. For
any other combination of LEDs, see “Power-supply LEDs” on page 29.
v DC power LED: Each hot-swap power supply has a dc power LED and an ac
power LED. When the dc power LED is lit, it indicates that the power supply is
supplying adequate dc power to the system. During typical operation, both the
ac and dc power LEDs are lit. For any other combination of LEDs, see
“Power-supply LEDs” on page 29.
v OUT OK power LED: Each hot-swap dc power supply has an IN OK power
LED and an OUT OK power LED. When the OUT OK power LED is lit, it
indicates that the power supply is supplying adequate dc power to the system.
During typical operation, both the IN OK and OUT OK power LEDs are lit. For
any other combination of LEDs, see “Power-supply LEDs” on page 29.
v Power-supply error LED: When the power-supply error LED is lit, it indicates
that the power supply has failed.
Note: Power supply 1 is the default/primary power supply. If power supply 1
fails, you must replace the power supply immediately.
v 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.
v Power-on LED: When this LED is lit and not flashing, it indicates that the server
is turned on. The states of the power-on LED are as follows:
Off: Power is not present, or the power supply or the LED itself has failed.
Flashing rapidly (4 times per second): The server is turned off and is not
ready to be turned on. The power-control button is disabled. This will last
approximately 20 to 40 seconds.
Flashing slowly (once per second): The server is turned off and is ready to
be turned on. You can press the power-control button to turn on the server.
Lit: The server is turned on.
Fading on and off: The server is in a reduced-power state. To wake the
server, press the power-control button or use the IMM web interface. See
“Logging on to the Web interface” on page 125 for information on logging on
to the IMM web interface.
v System-locator LED: Use this LED to visually locate the server among other
servers. You can use IBM Systems Director to light this LED remotely.
28 IBM System x3550 M3 Type 4254 and 7944: Installation and User's Guide
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