I don't get sound from certain games I've played. This has never happened in my old laptop, but it's happening on this for some reason. So far, Call of Duty B04, Mortal Kombat, Dark Souls, Middle Earth have no sound. I've tried everything I could to fix it for each and every one of these games, but nothing has worked. I was able to play these games just fine in my old laptop.
My laptop is an Alienware r3 15, I've bought it in January of this year.
So the system does have sound in some games?
Try uninstalling and reinstalling the audio driver.
Also, check the game settings.
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