Dell Precision 450 - Manual (Page 93)

Opening the Drive Door
1 floppy drive Access the floppy drive.
2 headphone
connector
Attach headphones.
3 microphone
connector
Attach microphone.
4 USB 2.0
connectors (2)
Use the front USB connectors for devices
that you connect occasionally, such as
joysticks or cameras.
It is recommended that you use the back
USB connectors for devices that typically
remain connected, such as printers and
keyboards.
5 IEEE 1394
connector
Attach high-speed serial multimedia
devices, such as a digital video camera.
6 diagnostic
lights (4)
Use the lights to help you troubleshoot a
computer problem based on the
diagnostic code. For more information,
see "
Diagnostic Lights ."
7 externally
accessible
drives
Access additional drives, such as a CD or
DVD drive. Drive arrangement varies on
computer configuration.