System Power Switch; Power Led; System Leds - HP B132L+ Owner's Manual

System Overview
System Unit Front Panel Controls and LEDs

System Power Switch

Use the Power switch to power the system unit on and off.
NOTICE: There is no need to manually shut down the HP-UX operating system on
your workstation before powering it off. When you turn off the power
switch, your workstation automatically shuts down the operating system
before terminating the power.

Power LED

The Power LED lights when the system unit power is on.

System LEDs

The system LEDs indicate the status of your workstation. In the event of a
system problem, the LEDs are lighted in different patterns to indicate error
codes. See Chapter 6 for a complete list of the system LED error codes.
12
LED 4 - System Heartbeat
LED 3 - SCSI Bus Activity
LED 2 - Network Receive
LED 1 - Network Transmit