Power Button; System Control Switch - Sun Microsystems Sun Fire V490 Parts Installation And Removal Manual

Power Button

The system Power button is recessed to prevent accidentally turning the system on
or off. The ability of the Power button to turn the system on or off is controlled by
the system control switch.
If the operating system is running, pressing and releasing the Power button initiates
a graceful software system shutdown. Pressing and holding in the Power button for
five seconds causes an immediate hardware shutdown.
Caution – Whenever possible, you should use the graceful shutdown method.
Forcing an immediate hardware shutdown may cause disk drive corruption and loss
of data.

System Control Switch

The four-position system control switch on the system's status and control panel
controls the power-on modes of the system, initiates service mode on next system
reset, and prevents unauthorized users from powering off the system or
reprogramming system firmware. In the following illustration, the system control
switch is in the Locked position.
System control switch
Power button
8 Sun Fire V490 Server Parts Installation and Removal Guide • October 2005