Dell PowerEdge 1800 Installation And Troubleshooting Manual page 14

Table 2-2. Front-Panel LED Indicators, Buttons, and Connectors (continued)
Indicator, Button,
or Connector
Power-on indicator
System identification
button
USB connectors
NMI button
14
Indicators, Codes, and Messages
Icon Description
The power-on indicator lights when the system power is
on. The power-on indicator blinks when power is
available to the system, but the system is not powered
on.
The power button controls the DC power supply output
to the system.
NOTE:
and the system is running an ACPI-compliant operating
system, the system performs a graceful shutdown before
the power is turned off. If the system is not running an
ACPI-compliant operating system, the power is turned off
immediately after the power button is pressed.
The identification buttons on the front and back panels
can be used to locate a particular system within a rack.
When one of these buttons is pushed, the blue system
status indicator on the front and back blinks until one of
the buttons is pushed again.
Connects USB 2.0-compliant devices to the system.
Used to troubleshoot software and device driver errors
when using certain operating systems. This button can
be pressed using the end of a paper clip.
NOTE:
support personnel or by the operating system's
documentation.
If you turn off the system using the power button
Use this button only if directed to do so by qualified