Why have I lost audio on YouTube, etc?

At times the audio is OK, listening to iTunes, for example. However, other times when watching a video there is no sound  I have checked the system preferences for sound.

1. Plug in the headphone and remove it.
2. Reset PRAM.  http://support.apple.com/kb/PH4405
3. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
4. Startup in Safe Mode
    http://support.apple.com/kb/PH14204

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