System Pulse Leds; Server Power Features - IBM System x3500 Installation And User Manual

System pulse LEDs

The following LEDs are on the system board and monitor the system power-on and
power-off sequencing and boot progress (see "System-board LEDs and controls" on
page 34 for the location of these LEDs):
Table 3. System pulse LEDs
LED
RTMM heartbeat
IMM2 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 integrated
management module II (IMM2) is shut down; however, the server can respond to
requests from IMM2, such as a remote request to turn on the server. The power-on
LED flashes to indicate that the server is connected to an ac power source 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 5 to 10 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 x3500 M4 Type 7383: Installation and User's Guide
Description
Power-on and power-off sequencing.
IMM2 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
technician only) replace the
system board.
The following steps describe the
different stages of the IMM2 heartbeat
sequencing process.
1. When this LED is blinking fast
(approximately 4Hz), this
indicates, that the IMM2 code is in
the loading process.
2. When this LED goes off
momentarily, this indicates that
the IMM2 code has loaded
completely.
3. When this LED goes off
momentarily and then starts
blinking slowing (approximately
1Hz), this indicates that IMM2 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, (trained
technician only) Replace the
system board.