Downloaded latest upgrade on my mac and now have not sound in earphones.

I uploaded the latest upgrade and now have no sound in my earphones. help

1. System Preference > Sound > Output >Headphone
    Highlight Headphones
    Make sure that Mute is not enabled.
2. Reset PRAM. http://support.apple.com/kb/PH14222
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.
    Plugin the headphone. Does the sound come through?
    Under Mute any of the boxes checked? If so,uncheck it.

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Downloaded latest upgrade on my mac and now have not sound in earphones.

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