Continue holding down the keys until the progress bar appears on your screen. You will hear the startup sound again and see the Apple logo on your screen. As soon as you hear the startup sound, hold down the Command, Option, P, and R keys simultaneously.Shut down your Mac and then turn it back on.This process is relatively simple and only takes a few minutes to complete: Resetting PRAM clears out the corrupt information and allows your Mac to start afresh.
If any of this information is corrupted, it can cause sound problems. PRAM stores certain types of data that need to be accessed quickly, such as system parameters and user preferences, including time zone, display settings, and speaker volume.
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