Do you have sound card driver??? If you don't have, please download in this <a rel='nofollow' href="http://www.findmysoft.com/drivers/ASRock-K8Upgrade-VM800-C-Media-UDA046_-build02-sound-card-driver.html">link</a>
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You will need to manually re-install the sound drivers for your laptop... most of the time the right sound drivers are called 'AC'97 Sound Drivers'. All you need to do is download or aquire a copy and install into your laptop then restart the laptop. If, if that does not solve your problem you will have to do some deeper reseach into your laptop to find out what the Sound card is and what specific software it takes to get sound back on your laptop.
Do you have the board driver ? if you have board driver insert the cd and go to the Device manager and right click on the sound which show question mark inside the device manager then update the driver from CD the it will install it
What model of LG laptop do you use? When installing new windows, you'll need to install the hardware driver such as sound device driver, vga controller driver etc. Basically the driver is in a CD provided by the laptop/desktop vendor when you purchase it. But you also can download it from the net. Just type the model of your laptop/desktop + driver. e.g : Acer Aspire 4142 driver.