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Message: <blockquote data-quote="rich a" data-source="post: 694057" data-attributes="member: 61513">Hi all,The other day, when I opened my MBA from sleep mode, a gray screen popped up saying that I had to restart my computer by pressing on the power button. Well, since then, I have had absolutely no sound on my computer.When I try to use the keyboard to raise/lower the volume, a little screen pops up with a circle with a line through it. In the menu bar at the top of my screen, where my volume status should be, there is only a blank space. Additionally, in System Preferences, there are "no output devices found."I have done nothing out of the ordinary, so I'm unsure as to what happened, and it's driving me nuts. I would really appreciate any help/answers you can offer.Thanks!</blockquote>