Dell Precision 490 - Manual (Page 5)

Front View (Desktop Orientation)
Back View (Desktop Orientation)
1 upper 5.25-
inch drive bay Holds a CD/DVD drive.
2 lower 5.25-inch
drive bay You can use the bay for an optional CD/DVD drive or a SATA hard drive.
3 FlexBay You can use the bay for a floppy drive or a Media Card Reader.
4 IEEE 1394
connector
(optional) Use the optional IEEE 1394 connector for high-speed data devices such
as digital video cameras and external storage devices.
5 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.
6 hard-drive
activity light The hard drive 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.
7 Dell™ rotatable
badge To rotate the Dell badge for tower-to-desktop conversion: remove the
front panel (see
Removing the Front Panel ), turn it over, and rotate the
plastic handle behind the badge.
8 power button Press to turn on the computer.
NOTICE: To avoid losing data, do not use the power button to turn off
the computer. Instead, perform an operating system shutdown.
NOTE: The power button can also be used to wake the computer or to
place it into a power-saving state. See Power Management for more
information.
9 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.
10 headphone
connector
Use the headphone connector to attach headphones.
11 microphone
connector
Use the microphone connector to attach a personal computer
microphone for voice or musical input into a sound or telephony
program.
12 network link
light
The network link light is on when a good connection exists between a
10-Mbps, 100-Mbps, or 1000-Mbps (or 1-Gbps) network and the
computer.
13 diagnostic
lights (4)
Use these lights to help you troubleshoot a computer problem based
on the diagnostic code. For more information, see
Diagnostic Lights .