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.
1 AC power LED (green)
2 DC power LED (green)
3 Power-supply error LED (amber)
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 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.
Turning on the server
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.
Turning off the server
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.
Chapter 4. Server controls, LEDs, and power 31
