Dell Inspiron 1720 (Mid 2007) - Manual (Page 72)

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Using Multimedia
6 Plug the other end of the digital audio cable into the S/PDIF input
connector on your TV or other audio device.
7 Turn on the TV, turn on any audio device that you connected (if
applicable), and then turn on the computer.
8 See "Enabling the Display Settings for a TV" on page 78 to ensure that the
computer recognizes and works properly with the TV.
Component Video and Standard Audio
1 composite video adapter 2 S/PDIF digital audio cable
1 S-video TV-out connector 2 component video adapter
1 2
2 1