Sony VGN-FS550 - Manual (Page 176)

Speakers
Why won't my speakers work?
 Make sure the speakers are properly connected and the volume is turned up loud enough to hear sound.
 Make sure the speaker volume is not muted and is loud enough to hear sound. Use the Fn+F2 keys to toggle the
mute option on and off, and use the Fn+F4 keys to increase the volume.
 Your speakers may not be designed for computer use.
 If the speakers have a mute button, set the button to off.
 If the speakers have a volume control, make sure the volume is turned up loud enough to hear sound.
 If you have connected an audio cable to the Headphones jack, disconnect the cable and use the speaker cable that
was supplied with the speakers.
 If you are using battery power, make sure the battery is inserted properly and is charged.
 If the speakers require external power, make sure the speakers are connected to a power source. See the guide
that accompanied the speakers for more information.
Page 176