Table 5. System pulse LEDs (continued)
LED Description Action
IMM heartbeat IMM heartbeat boot process. The following steps describe the
different stages of the IMM heartbeat
sequencing process.
1. When this LED is blinking fast
(approximately 4Hz), this
indicates, that the IMM code is in
the loading process.
2. When this LED goes off
momentarily, this indicates that
the IMM code has loaded
completely.
3. When this LED goes off
momentarily and then starts
blinking slowing (approximately
1Hz), this indicates that IMM is
fully operational. You can now
press the power-control button to
power-on the server.
4. If this LED does not blink within
30 seconds of connecting a power
source to the server, complete the
following steps:
a. (Trained service technician
only) use the IMM recovery
jumper to recover the firmware
(see “System-board switches
and jumpers” on page 30).
b. (Trained service technician
only) replace the system
board.
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 service processor
(the Integrated Management Module) is shut down; however, the server can
respond to requests to 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 ac
power but is not turned on.
Turning on the server
Approximately 5 seconds after the server is connected to ac 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 1 to 3 minutes after
the server is connected to ac 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:
v If a power failure occurs while the server is turned on, the server will restart
automatically when power is restored.
Chapter 4. Server controls, LEDs, and power 35
