Thereis no sound on my macbook air. I have checked the volume and mute controls and the internal speaker are selected.  any one any ideas please.

there is no sound on my macbook air. I have checked the volume and mute controls and the internal speaker are selected.  any one any ideas please.

Hopefully one of these steps should solve the problem.
1. 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.
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. 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.
Best.

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