Sun Microsystems Sun Fire V440 Parts Installation And Removal Manual page 19

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 keyswitch.
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
four seconds causes an immediate hardware shutdown.
Caution – Whenever possible, use the graceful shutdown method. Forcing an
immediate hardware shutdown can cause disk drive corruption and loss of data.
System Control Keyswitch
The four-position system control keyswitch on the front panel controls the power-on
modes of the system and prevents unauthorized users from powering off the system
or reprogramming system firmware. In the following illustration, the system control
keyswitch is in the Locked position.
Power button
Locked position
Chapter 1 Identifying Front Panel and Back Panel Features 7