Dell T7400 Activity light, When a device such as your CD drive is operating, Ieee, Connector, Usb

45.25-inch drive bay with special 3.5-inch drive panel plate

Can hold a CD/DVD drive, or a media card reader, a floppy drive, or a SATA hard drive in a 5.25-inch drive bay carrier. The drive-panel plate shown here is only for use with a floppy drive or media card reader; you can install the plate in front of any of the four 5.25-inch drive bays. For more information, see "Drive Panels" in your User’s Guide.

The hard-drive carrier is only for use in the 5.25-inch drive bays. The floppy-drive/media card reader and hard-drive carriers are not interchangeable.

5	hard-drive	The hard drive light is on when the computer reads data from
	activity light	or writes data to the hard drive. The light might also be on
		when a device such as your CD drive is operating.
6	IEEE 1394	Use the IEEE 1394 connector for high-speed data devices
	connector	such as digital video cameras and external storage devices.
7	USB 2.0	Use the front USB connectors for devices that you connect
	connectors (2)	occasionally, such as flash memory keys, cameras, or bootable
		USB devices.
		Dell recommends that you use the back USB connectors for
		devices that typically remain connected, such as printers
		and keyboards.
8	power button,	Press the power button to turn on the computer. The light in
	power light	the center of this button indicates the power state. For more
		information, see "Controls and Lights" in your User’s Guide.
		NOTE: To avoid losing data, do not use the power button to
		turn off the computer. Instead, perform an operating system
		shutdown.
9	Dell badge	You can rotate the Dell badge so that "Dell" is read horizontally,
		depending on whether you use the desktop or tower orientation.
10	headphone	Use the headphone connector to attach headphones.
	connector
11	microphone	Use the microphone connector to attach a personal computer
	connector	microphone for voice or musical input into a sound or
		telephony program.
12	diagnostic	Use these lights to help you troubleshoot a computer
	lights (4)	problem based on the diagnostic code. For more information,
		see "Diagnostic Lights" in your User’s Guide.
13	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.

Quick Reference Guide

19