This article aims to help you troubleshoot and fix sound problems. More specifically, several Mac users have reported that they are unable to change / adjust sound / volume.
If you can’t adjust volume, here is how you can fix:
Please complete each step before moving on.
If audio stops working properly in OS X, the first thing you should do is to go to System Preferences > Sound > Output and check your sound settings. Make sure that your settings are correct.
Restart your Mac
Restart your Mac. This may help. (Apple menu > Restart…)
Reset Core Audio
You may want to reset the Core Audio process. Here is how:
Launch Terminal and enter the following command:
sudo killall coreaudiod
then press enter (you may need to enter your admin password).
Reset PRAM / NVRAM
Speaker volume information is stored in PRAM (on older Macs) or NVRAM (on newer Intel-based Macs). Resetting this may resolve your problem. Here is how:
- you may want to print these steps, as the process involves turning off your Mac.
- turn off your Mac (Apple menu > Shut Down…).
- press the power button to turn on your computer.
- press and hold the Command, Option, P, and R keys at the same time, after you hear the start up sound. Note that it is important you press these keys before the Apple logo appears.
- keep holding the keys until your Mac restarts.
- when you hear the second start up sound, release the keys.
Audio Midi Setup
Launch Spotlight (Command-Space). Make sure that:
- “Built-in Output” is selected
- “44100 HZ” and “2ch-16 bit Integer” is selected