"My Volume stuck on mute"に関する回答This happened to me. The mute was staying grey. I tried zapping the PRAM and got it to work once. Then I bought a new audio cable here on ifixit. I was nervous to install it because I know NOTHING about fixing computers. But the instructions were super clear and I did it in less than an hour. AND IT WORKED! I was so happy to hear that chime when I turned it back on! Good luck!