why is my sound greyed out
my sound randomly stopped working, why i try to turn it up on the top of my computer in the bar it doesnt let me change the volume and it is greyed out. when using my keyboard to turn it up it doesnt let me and there is a circle with a line through it (the no symbol) that shows up.
it works with headphones and there is sometimes a red light coming out of the headphone jack
what do i do?!
my computer is brand new and the sounds not working already!
MacBook Pro