My sound coming from the internet on my MacBook Air is not working!

I bought this MacBook Air a month ago is the new one, everything was working well but suddenly the sound coming from the internet stop working.
My computer sound is working perfectly is just when I want to watch a video or listed a song from youtube talk on skype isnt working at all.
When I press the volume button i can hear it.
Can someone tell me what can it be?

Hopefully one of these steps should solve the problem.
1. System Preference > Sound > Output > Internal Speakers
    Highlight Internal Speakers / Headphones
    Make sure Mute is not enabled.
2. Remove the headphone.
    If you see red light in the headphone port, plug the headphone
    in and out of the port 5 or 6 times to flip the microswitch inside.
    Sound output may be stuck in the digital mode.
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. Applications > Utilities > Audio MIDI Setup
    Audio Devices window
    Side Bar
    Click the Built-in Output.
    Under Mute any of the boxes checked? If so, uncheck it.

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My sound coming from the internet on my MacBook Air is not working!

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