Dell Precision 390 - Manual (Page 27)

Front View (Desktop Orientation)
NOTE: Check the documentation for cards to ensure that you can
accommodate them in your configuration. Some cards that require more
physical space and power (such as PCI Express graphics cards) may
restrict the use of other cards.
1 upper 5.25-
inch drive bay Holds a CD/DVD drive.
2 lower 5.25-inch
drive bay Holds an optional CD/DVD drive or an optional third hard drive (SATA
only).
3 3.5-inch drive
bay You can use the bay for a floppy drive or an optional Media Card
Reader.
4 hard-drive
activity light The hard-drive activity light is on when the computer reads data from or
writes data to the hard drive. The light might also be on when a device
such as your CD player is operating.
5 IEEE 1394
connector
(optional) Use the optional IEEE 1394 connectors for high-speed data devices
such as digital video cameras and external storage devices.
6 USB 2.0
connectors (2) Use the front USB connectors for devices that you connect occasionally,
such as flash memory keys or cameras, or for bootable USB devices
(see
System Setup for more information on booting to a USB device).
It is recommended that you use the back USB connectors for devices
that typically remain connected, such as printers and keyboards.
7 power button Press to turn on the computer.
NOTE: The power button can also be used to wake the system or to
place it into a power-saving state. See Power Management for more
information.
NOTICE: To avoid losing data, do not use the power button to turn off
the computer. Instead, perform an operating system shutdown.
8 power light The power light illuminates and blinks or remains solid to indicate
different states:
¡ No light — The computer is turned off.
¡ Steady green — The computer is in a normal operating
state.
¡ Blinking green — The computer is in a power-saving state.
¡ Blinking or solid amber — See Power Problems .
To exit from a power-saving state, press the power button or use the
keyboard or the mouse if it is configured as a wake device in the
Windows Device Manager. For more information about sleep states and
exiting from a power-saving state, see
Power Management .
See Diagnostic Lights for a description of light codes that can help you
troubleshoot problems with your computer.
9 diagnostic
lights (4) Use the lights to help you troubleshoot a computer problem based on
the diagnostic code. For more information, see
Diagnostic Lights .
10 microphone
connector
Use the microphone connector to attach a personal computer
microphone for voice or musical input into a sound or telephony
program.
11 headphone
connector
Use the headphone connector to attach headphones.
12 network link The network link light is on when a good connection exists between a