After clean installing Yosemite and rebooting my MacBook Pro, audio seems to be deactivated, although the sound is active and I can use it. But I can't change the volume. The icon in the menu bar is grayed out:
If I run
sudo killall coreaudiod
in the terminal, it is activated and I can use it as usual again.
What could cause the problem and how can I fix it?
Best Answer
Have you tried a NVRAM and SMC reset?