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It is possible that you may need a new driver for your laptop, check acers website and download the sound driver for your specific model and that might fix the problem for you. Please let me know if this helps, Jeff from fixya
Most likely you need to install drivers for your sound card. Confirm this, please check your device Manager (right-click My Computer - Manage - Device Manager) for unknown/improperly installed devices.
Next Please visit you computer manufacturer's website, and download drivers along with the installation instructions.
This issue will occur if the Computer speakers are not to the default Audio Device. Please right click on the Sound icon on the right corner of the Taskbar (System Trey) and select the "Playback Devices". After that, please right click on the "Speaker/Headphones" to set them as the default Audio Device. This should enable the Computer speaker and sound should work correctly.
If the above steps did not resolve the issue, you may need to re-install the Audio Driver in the Computer to resolve the issue. You can download the Audio Driver using the below link.
If you have the internet, goto my computer and right click, then goto properties, enter device manager, goto sound,video and game controllers right click on the exclamation mark or your audio driver and click update driver, use the internet option to download the driver, it takes a few minutes so be patient. once done reboot the mechine.
Make sure that your 'automatic updates' is turned on first of all. Next, you need to go to Device Manager. (Right click on My Computer & go down and click on Properties, then the hardware tab. Then click on 'Device Manager') One of the listings ( probably under 'sound, video and game controllers') should have an exclaimation point next to it. Right click this device and choose 'update driver' and follow the 'default' instructions. If this doesn't help, right click again choose 'properties' for the same device then you should be able to download the driver from the PC's manufacturer, Microsoft or try Download.com (driver downloads).