Dell Precision T7400 Quick Reference Guide - Page 19
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4 5.25-inch drive Can hold a CD/DVD drive, or a media card reader, a floppy bay with special drive, or a SATA hard drive in a 5.25-inch drive bay carrier. The 3.5-inch drive drive-panel plate shown here is only for use with a floppy drive panel plate 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 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 drive is operating. 6 IEEE 1394 connector Use the IEEE 1394 connector for high-speed data devices such as digital video cameras and external storage devices. 7 USB 2.0 connectors (2) Use the front USB connectors for devices that you connect 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, power light Press the power button to turn on the computer. The light in 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 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 diagnostic lights (4) Use these lights to help you troubleshoot a computer 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