Compaq Presario 6500 - Desktop PC Using

Using
Headphones
Your PC uses digital CD audio.
The headphone connector on the
front of your DVD Writer drive is
disabled by the operating system.
To use headphones, connect them
to the connector labelled Out (Line
Out or Speaker) on the back of the
PC. You may need to disconnect
your speakers to connect your
headphones.
Line Out
OUT
Speaker
Note:
Some PC models do not include
a speaker connector.