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Go into ur control panel to device manager and then scroll to the audio driver. Remove all that is under that section then reboot the pc. If it doesnt reload the sound driver or it still doesnt work go to your manufacture website and download the audio driver again.
You need the sound driver I assume for this laptop. If it doesnt match hardware perfectly then nothing will work.
Go to vendors site with your S/N and Model number to locate the exact sound driver.
Have you checked in control panel / sound speech / sounds & audio devices / click on "sounds" blind and see if any of the sounds can be activated by clicking the big black arrow. If greyed out then the driver is not installed.
Please make sure to follow the steps to the audio drivers exactly as you need to make sure you have the Microsoft Universal Audio Architecture Bus Driver for High Def Audio installed before you install the other audio driver.
I've read that this is time consuming but it works..good luck!
Go here http://www.acerpanam.com/flex/acerdrivers/bin/drivers.html?CFID=3400939&CFTOKEN=29928692 choose notebook, your model, look for the Realtek Audio Driver. There are two there so i would say download both. Uninstall your sound card drivers in control panel -> system -> hardware -> Device Manager. And then install one of the drivers if it doesnt work do the it all again but then install the other driver. Hopefully that will work. If not some audio/ripping/music-player type software you have installed is causing a conflict.