My volume control is gone from my computer. I have no sound and even when I go into system preferences it is set on max and to show on desktop but it is in grey and unchangeable. No sound comes out of any program and my itunes won't even play songs much less me being able to hear them. Isn't there some way for me to go back in time and have my computer reset everything as it was last week???? I have no idea why this happened.