Dell Inspiron 1526 (Late 2007) - Manual (Page 73)

Using Multimedia
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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 74 to ensure that the
computer recognizes and works properly with the TV.
Enabling S/PDIF Digital Audio
1 Double-click the speaker icon in the Windows notification area.
2 Click the Options menu and then click Advanced Controls.
3 Click Advanced.
4 Click S/PDIF Interface.
5 Click Close.
6 Click OK.
HDMI (Optional)
HDMI (High-Definition Multimedia Interface) connector carries an
uncompressed all digital signal to produce hi-definition video and audio.
1 Turn off the computer and the TV and/or audio device that you want to
connect.
2 Plug one end of the HDMI cable into the HDMI output connector on the
computer.