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” on page 37 for
the location of these LEDs):
Table 3. System pulse LEDs
LED Description Action
RTMM 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 technician only)
replace the system board.
IMM2 heartbeat IMM2 heartbeat boot process. 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.
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.
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.
v If your operating system supports the Wake on LAN feature, the Wake on LAN
feature can turn on the server.
Notes:
1. When 4 GB or more of memory (physical or logical) is installed, some memory
is reserved for various system resources and is unavailable to the operating
Chapter 1. The System x3550 M4 server 27
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