Powering the System On and Off
The system can be powered on after the following cables are connected:
v All RIO cables
v All SPCN cables
v JTAG cable
v Inter-rack operator panel cable
v All PCI cables to supported drawers
After the required cables are installed and the power cables are connected, the power
button on the system operator panel can be pushed one time to initialize the system (if
the button is pushed two times, the system powers off). Progress indicators, also
referred to as checkpoints, are visible on the operator panel display and the green LED
to the right of the power button illuminates, indicating the system power is on.
The remote I/O drawers are powered up through the system power control network
(SPCN) controls and interfaces in both the system rack and I/O drawers. When power
is applied, a light-emitting diode (LED) on the I/O drawer indicator panel goes from
blinking (green) to on continuously, which indicates that power levels are satisfactory in
the drawers.
If the system is operating under AIX, enter the shutdown -F command to power off the
system. If you cannot use this method, you can power off the system by pressing the
operator panel power button two times.
Attention: Using the operator panel power pushbutton to power off the system may
cause unpredictable results in the data files, and the next IPL will take longer to
complete.
For complete details on how to power the system on and off, go to “Powering Off and
Powering On the System” on page 492 and “System Power-On Methods” on page 470.
Console Strategy
The firmware invokes a console-selection sequence at system boot time if any of the
following is true:
v A console has not yet been selected.
v A previous console-selection sequence timed out.
v A change occurred in the system configuration affecting the console (keyboard
installed/removed, mouse installed/removed, graphics adapter installed/removed or
moved to another PCI slot).
The console-selection sequence allows the selection (from the appropriate input device)
of one of the available console devices. If no console is selected within approximately
60 seconds, serial port 1 (com1) is selected as the console, and the selection sequence
times out.
Chapter 1. Reference Information 3
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