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Right click on the speaker icon and select properties and see if the sound is muted on the slider, if all is ok, click start>run then type 'dxdiag' and hit enter.
look on the sound tab and it will tell you if there are any sound driver errors
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you need to install the audio driver go into control panel click on device manager there will be a yellow question mark next to your audio output click on re install driver and click on search the internet for the driver have any problems email my company
It is obvious that your computer shutdown because it is overheating. try to get a chill mat to place it under computer. you said that it does not shut down when is on battery??? do you play games when is on battery?....computers normally overheat during large processing tasks such us playing video games. Try to fans clear do not place your laptop ontop of your bed or anything that will obstruct the fan under computer.