after the required cables are installed and the power cables are connected, the hmc user interface provides a power-on function to turn on the power to the system. the power button on the operator panel can be pushed to initialize the system but the preferred method is to use the hmc if booting logical partitions. progress indicators, also referred to as checkpoints, are visible on the operator panel display as the system power is turned on. the power led on the base system stops blinking and stays on, indicating the system power is on. the base system and i/o subsystems are powered on through the system power control network (spcn).

    when power is applied, the power leds on the base system go from blinking to continuous, and the power leds on the i/o subsystem(s) come on and stay on. this indicates that power levels are satisfactory in the subsystems.