So, today, my sound went into mute and prohibited me from unmuting and my battery did that awesome X over the battery. At the same time. I wasn't doing anything out of the ordinary, just watching some Netflix. After scouring the web and trying everything from putting in headphones (there's a red light sometimes, but only after removing headphones which were not used when this occurred.) to resetting the PRAM, also taking out the battery and holding down power for 5 seconds (which fixed the battery x, thankfully.) and blowing out the optical hoo-ha with canned air. Nothing seems to work. I do hear the chime when I've been restarting... so hopefully that's good? Please help!