I'm not really sure if my sound is broken or if it needs repairing but it keeps going on and off. Once in a while the sound will go off and when I click on the volume button, usually the volume symbol is white and the sound level bubbles will be too. In my case, the volume symbol will be transparent (see-through) and the bubbles will not be filled at all (like its mute) and below the bubbles will be a circle and a slash across it. (Picture of what I am talking about ^) The only way for me to fix this reoccuring problem is to restart my computer which is VERY annoying and fustrating. And sometimes restarting may not work and I would have to restart it several times to get it to work again..until the problem comes up again.... This problem occurred probably 3-4months ago, but I thought it wasn't a big deal..I also just came back from a long vacation and thought maybe a long rest will do the trick..but nope =( Please help!