Dell XPS 720 Owner's Manual - Page 15
Front I/O Connectors, Use the front USB connectors for devices that you connect occasionally, such - will not boot up
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Front I/O Connectors 1 2 3 4 5 6 7 1 microphone connector Use the microphone connector to attach a personal computer microphone for voice or musical input into a sound or telephony program. 2 headphone connector Use the headphone connector to attach headphones. 3 diagnostic lights (4) Use the sequence of these diagnostics lights to help troubleshoot a problem with your computer (see "Dell Diagnostics" on page 72). 4 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 may also be on when a device such as your CD player is operating. 5 network link light The network link light is on when a good connection exists between a network and the computer. 6 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. For more information on bootable USB devices see "Boot Sequence" on page 173. Dell recommends that you use the back USB connectors for devices that typically remain connected, such as printers and keyboards. 7 IEEE 1394 connector Use the IEEE 1394 connector for high-speed data devices such as digital video cameras and external storage devices. Setting Up and Using Your Computer 15