Server Power Features - IBM System x3550 M3 Type 4254 Installation And User Manual

Table 3. System pulse LEDs
LED
Enclosure management heartbeat
IMM heartbeat

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
power but is not turned on.
Turning 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
Description
power-on and power-off sequencing.
IMM heartbeat boot process.
Action
1. If the LED blinks at 1Hz, it is
functioning properly and no action
is necessary.
2. If the LED is not blinking, (trained
service technician only) replace
the system board.
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 39).
b. (Trained service technician
only) replace the system
board.
Chapter 1. The System x3550 M3 server
31