Hello Good Day to all mac users my audio doesnt work. the volume option on the top right is grayed out. if i click it, i cant unmute it. if i press the increase or decrease volume, doesnt work either. i dont know what i have done to get this problem. as i remembered, i only updated my bittorent and cleanapp applications. after that, i just noticed that the volume is now on mute. Here are the t/s i have done. (i havent tried to unplug the battery yet) 1.shutdown 2.force shutdown 3.smc and pram reset 4.repair permissions 5.went to sound in system pref, output volume is set to "built-in" which is correct, but volume adjuster grayed out as well. 6.didn't turn on laptop for a day Hope i can get a solution. thanks!