My mac book has no more sound

sound stop playing on my mac book; the keyboard controls no longer work either

Go step by step and test.
Hold the option key down and click the sound icon in the menu bar and select internal speakers
1. System Preference > Sound > Output > Internal Speakers
    Highlight  Internal Speakers.
    Make sure that Mute is not enabled.
2.Plug in and  remove the headphone.
    If you see red light in the headphone port or not, 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 PRAM.  http://support.apple.com/kb/PH14222
4. 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".
5. 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.
    Option click the speaker icon, if present and select Internal Speakers.
5. 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.
6. System Preferences > Sound> Sound Effects
    Play sound effects through:
   Select "Internal speakers" and then back to "Selected sound output device".

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