Today, suddenly, my MacBook Pro is gone mute. The speaker icon on the top bar is faded gray and within the output devices there is not the option internal speaker anymore but just digital output and two Soundflower options. I've tried what was suggested in the thread Sound not working when running OS 10 Yosemite but it didn't worked. When I restart my Mac, it makes the opening sound and it works with headphones.
What should I do to restore the sounds?