Dell Precision T5400 Quick Reference Guide - Page 19
NOTICE, Quick Reference Guide - diagnostic lights
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6 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" in your User's Guide for more information on booting to a USB device). Dell recommends that you use the back USB connectors for devices that typically remain connected, such as printers and keyboards. 7 Dell rotatable badge To rotate the Dell badge for tower-to-desktop conversion: remove the front panel ("Removing the Computer Cover" in your User's Guide), turn it over, and rotate the plastic handle behind the badge. 8 power button, power light Press the power button to turn on the computer. The light in the center of this button indicates power state. See "Controls and Lights" in your User's Guide for more information. NOTICE: To avoid losing data, do not use the power button to turn off the computer. Instead, perform an operating system shutdown. 9 headphone connector Use the headphone connector to attach headphones. 10 microphone connector Use the microphone connector to attach a personal computer microphone for voice or musical input into a sound or telephony program. 11 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. 12 diagnostic lights (4) Use these lights to help you troubleshoot a computer problem based on the diagnostic code. For more information, see "Power Lights" on page 27. Quick Reference Guide 19