HP Compaq Presario,Presario 8380 Supplementary Manual page 33

Connecting to a Stereo System
Your computer can be connected to your stereo
system for games or multimedia applications. First,
you'll need a cable that has a 3.5mm stereo plug on
one end and two RCA plugs on the other end. (You
can buy such a cable at most consumer electronics
stores.) Then, connect any unused line-level input
connector on the stereo system to the line output on
the audio card (see illustration).
When your computer and your stereo system are
connected, the volume levels can be adjusted with
either the computer keyboard Volume knob or the
Audio Line Out
stereo volume control.
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Chapter 3 Upgrading and Servicing Your Computer