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I have the same laptop as you, mine is also a Sony Vaio but mine is fine. Did you check the task bar? Along the bottom of the screen on the right, there is a small arrow head, click and select the speaker icon then set up your volume from there. Failing that Pc World should be able to solve it within minuets for a small charge or any local pc/laptop dealer
Hopefully this helps. Right click on your volume control icon. Open the "Volume Mixer," and make sure that nothing has the mute X on. Then right click on "Volume Control," and make sure that the volume control is checked to play all sounds, and that your Speaker box is checked. Next step is your music, if the sound was muted directly @ the music playback, this could be the problem. Open your Media Player and try to play music, if you cannot hear it, click on the mute button to the song playing. If your Player was shut off in the "mute" mode, then you will not hear sound. It Happened to me once. You will need to check all of your "Players" to see if any of them were shut off in "mute."
1. Yes, check to see if you have the volume up for the wave file turned up that is on the program you are using to listen to the Mp3 or sound wave with. 2. check the speaker connector/ Use another speaker that is know to be good and test. Use a set of earphone in the output jack also to test the output. If these things are doing the same then you have failing sound card and it needs replacement.
The plus (+) and minus (-)
volume control buttons on the touch sensor bar above the keyboard may
not work properly if the touchpad driver is not installed properly.
other buttons on the touch sensor bar, such as the play, forward, or
rewind buttons, may still work properly. To resolve the issue,
download and install the original Synaptics® Touchpad Driver (or an
updated version of that driver, if available) from the Drivers & Software link on this page.
you need to install your sound driver and camera driver again. but in compatible mode. this time you open the control panel and look for the option under programs and features titled"run program made for older version of windows" and install the two drivers.they will start working