i found these -
http://windows.microsoft.com/en-US/w...sound-problems

[ 1.

Open Audio Devices and Sound Themes by clicking the Start button Picture of the Start button, clicking Control Panel, clicking Hardware and Sound, and then clicking Sound.
2.

Click the Playback tab, click Speakers, and then click Properties.
3.

Click the Levels tab, and then, under Line In, click the Mute button Picture of the Mute button to enable sound for the line-in connection.
]


http://support.microsoft.com/gp/no_s...ntrypoint=WHHT