IBM 79463AU, Installation And User Manual

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Table 3. System pulse LEDs
LED Description Action
Enclosure manager heartbeat power-on and power-off sequencing.
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.
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 Table 4 on page 39).
b. (Trained service technician
only) replace the system
board.
Server power features
When the server is connected to 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
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.
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IBM System x3550 M2 Types 4198 and 7946: Installation and User’s Guide