My macbook pro external speaker not working! help please

My macbook pro external speaker not working! help please

1. Applications > Utilities > Audio MIDI Setup
    Audio Devices window
     Pllug in the speakers.
     Do they show up?
     Make sure that Mute is not enabled.
2. 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".
Best.

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