You might also find that your sound issues have been resolved.Realistically, resetting the SMC is unlikely to affect your sound issue but at this stage we’re guessing you’ll try the lot.
Apple previewed the new version of the Mac operating system alongside i OS 9 at the Worldwide Developers Conference on Monday 8 June.
It then released a public beta of the new operating system, so a lot of people were able to try it out.
Before you restart your computer, try restarting the Core Audio process.
Open a Terminal window and input: You may notice that your computer is a little slower to start up, and that certain settings have been reset (the time, volume, keyboard preferences and so on).
If you’re using a laptop, you’ll probably want to choose “Internal Speakers” (or “Headphones” if you’re using them).