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Powering the System On and Off
For procedures to power off and power on the system for various system configurations and operating
systems, see "Stopping the System" on page 282 and "Starting the System" on page 283.
Console
Note: This section applies to a system without an HMC attached.
The firmware starts 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 in the system configuration affects the console (keyboard installed or removed, mouse
installed or removed, graphics adapter installed or removed or moved to another PCI slot).
The console-selection sequence allows you to select (from the appropriate input device) any one of the
available console devices. If no console is selected within approximately 60 seconds, serial port 1 (S1) is
selected as the console and the selection sequence times out.
Attention:
If an ASCII terminal is attached to serial port 1 (S1), and there is any interaction with this
terminal:
v After OK displays in the operator panel
AND
v Before the power-on sequence is initiated
the firmware will use this terminal as the console, regardless of the previous console selection.
After a console has been selected, the console-selection sequence is only started at boot time if there is a
change in the system configuration (as previously described), or the contents of the system's nonvolatile
memory (NVRAM) are lost.
Note: Moving an ASCII terminal from one serial port to another (from S1 to S2) cannot be detected by the
firmware, so it does not constitute a configuration change.
You can also initiate a system console-selection sequence from the SMS menus.
Power-On Self-Test
After power is turned on and before the operating system is loaded, the system does a power-on self-test
(POST). This test performs checks to ensure that the hardware is functioning correctly before the
operating system is loaded. During the POST, a POST screen displays, and POST indicators appear on
the firmware console (if one is connected). The next section describes the POST indicators and functions
that can be accessed during the POST.
Chapter 1. Reference Information
7
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