My macairbook all of a sudden hasn't any sound?

My macbook air all of a sudden doesn't have any sound, have any of you experienced this?

Try a reset:
Hold the Sleep and Home button down for about 10 second until you see the Apple logo.

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    Try a reset:
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  • Why am I all of a sudden not receiving any texting videos or pictures?

    Why am I all of a sudden not receiving any texting pictures or videos?

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    I have an ipad2 and all of a sudden I have stopped getting sound in my game apps. I get normal sound on YouTube and I player and downloaded DVDs. If I plug headphones in then I can get sounds for the games. I have switched the lock screen button off and on again and done a reset twice, can anyone help me with this?

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    http://support.apple.com/kb/ts1630
    http://www.atreks.com/app-no-sound-on-ipad-4-%E2%80%93-what-to-do/
    To solve some sound problems, just follow these simple steps
    1. Go to Settings
    2. Tap on General
    3. Tap on Reset
    4. Tap on Reset All Settings
     Cheers, Tom

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    There may be 2 separate issues here.
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