No sound via Internal speakers headphones etc
I have a MacBook Pro (Retina, 13-inch, Late 2013), current OS is X 10.10.5.
I have lost sound from the internal speakers, headphone jack, even on 2 x different Bose Soundlink speakers, one a V2 the other a V3.
The menu bar icon is grey and can't be changed, I have followed all the Mac help recommendations.
Hoping for something here.
MacBook Pro with Retina display, OS X Yosemite (10.10.5), late 2013