Power-Supply Leds; Server Power Features; Turning On The Server; Turning Off The Server - Lenovo ThinkServer RD220 3797 Series Installation And User Manual

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Power-supply LEDs

The following illustration shows the power-supply LEDs on the rear of the server.

For more information about solving power-supply problems, see the Hardware

Maintenance Manual.

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 Integrated Management

Module (IMM) is shut down; however, the server can respond to requests from the

IMM, such as a remote request to turn on the server. The power-on LED flashes to

indicate that the server is connected to power but is not turned on.

Approximately 3 minutes after the server is connected to power, the power-control

button becomes active, and one or more fans might start running to provide cooling

while the server is connected to power. You can turn on the server and start the

operating system by pressing the power-control button. If a power failure occurs

while the server is turned on, the server will restart automatically when power is

restored.

For 32-bit operating systems only: 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.

When you turn off the server and leave it connected to power, the server can

respond to requests from the IMM, such as a remote request to turn on the server.

While the server remains connected to power, one or more fans might continue to

run. To remove all power from the server, you must disconnect it from the power

source.

Important: To view the error LEDs on the system board, leave the server

connected to a power source.

AC power LED (green)

DC power LED (green)

Power-supply error LED (amber)

Chapter 4. Server controls, LEDs, and power

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