Server Power Features - Lenovo System x3650 M4 Installation And Service Manual

operation, the ac power LED is lit. For any other combination of LEDs, see "AC power-supply LEDs" on
page 179.
• DC power LED: Each hot-swap ac power supply has a dc 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 "AC power-supply
LEDs" on page 179.
• IN OK power LED: Each hot-swap dc power supply has an IN 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 "DC power-supply LEDs" on page 180.
• OUT OK power LED: Each hot-swap dc power supply has 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 "DC power-supply LEDs" on page 180.
• 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.
• 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 5 to 10 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.
• System-locator LED: Use this LED to visually locate the server among other servers. You can use
Systems Director or IMM2 web interface 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.

Server power features

When the server is connected to an ac power source but is not turned on, the operating system does not
run, and all core logic except for the integrated management module II (IMM2) is shut down.
However, the server can respond to requests from IMM2, such as a remote request to turn on the server. The
power-on LED flashes to indicate that the server is connected to an ac 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 5 to 10 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:
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Lenovo System x3650 M4 Installation and Service Guide