How to fix “No Sound Output Devices” problem on Mac OS
January 12th, 2011 by Phong Vu    

I have had this problem on my 2009 Nehalem 8-core Mac Pro, and resetting PRAM fixes this problem.

Here is the instruction on how to reset your PRAM.

  1. Shut down the computer.
  2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  6. Release the keys.

More information on resetting your PRAM here.

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