Dell Latitude D420 - Manual (Page 5)

power button — Press the power button to turn on the computer or exit a power management mode (see Power Management Modes ).
Back View
USB connectors
modem connector (RJ-11)
network connector (RJ-45)
video connector
AC adapter connector — Attach an AC adapter to the computer.
1 air vent 2 WiFi Locator - Wireless On/Off switch 3 power button
1 network connector (RJ-45) 4 video connector 7 IEEE 1394 connector
2 modem connector (RJ-11) 5 powered USB connector 8 AC adapter connector
3 USB connectors (2) 6 infrared sensor
Connect a USB device, such as a mouse, keyboard, or printer. You can also
connect the optional floppy drive directly to a USB connector using the
optional floppy drive cable.
If you ordered the optional internal modem, connect the telephone line to
the modem connector.
For information on using the modem, see the online modem
documentation supplied with your computer. See
Finding Information for
information about accessing online user's guides.
NOTICE: The network connector is slightly larger than the modem connector. To avoid damaging the computer, do not plug a telephone line into the
network connector.
Connects the computer to a network. The two lights next to the connector
indicate the status of both the connection and the transfer of information
for wired network communications.
For information on using the network adapter, see the device user's guide
supplied with your computer. See
Finding Information .
Connects an external monitor. For more information, see Using the
Display .