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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 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.
• 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.
• 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
information on logging on to the IMM web interface.
• 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.
Server power features
When the server is connected to a power source but is not turned on, the operating system does not run, and
all core logic except for the service processor (the integrated management module) is shut down; however,
the server can respond to requests from the service processor, such as a remote request to turn on the
server.
The power-on LED flashes to indicate that the server is connected to a power source but is not turned on.
Turning on the server
Use this information to turn on the server.
Approximately 5 seconds after the server is connected to power, one or more fans might start running to
provide cooling while the server is connected to power and the power-on button LED will blink quickly.
Approximately 20 to 40 seconds after the server is connected to power, the power-control button becomes
active (the power-on LED will blink slowly), and one or more fans might start running to provide cooling while
the server is connected to power. You can turn on the server by pressing the power-control button.
The server can also be turned on in any of the following ways:
• If a power failure occurs while the server is turned on, the server will restart automatically when power is
restored.
• If your operating system supports the Wake on LAN feature, the Wake on LAN feature can turn on the
server.
Note: When 4 GB or more of memory (physical or logical) is installed, some memory is reserved for various
system resources and is unavailable to the operating system. The amount of memory that is reserved for
system resources depends on the operating system, the configuration of the server, and the configured PCI
options.
"Power-supply LEDs" on page
"Logging on to the Web interface" on page 524
391.
.
Chapter 2
The Lenovo System x3550 M3 server
for
15
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