Why doesn't my audio output work?

Hi everyone - my macbook pro speakers don't work. I've looked at other posts and tried plugging the headphones in and out. When I play with them a few times, the sound comes back for a split second and then goes away. Any advice for fixing? Thanks.

Hopefully one of these steps should solve the problem.
1. System Preference > Sound > Output > Internal Speakers
    Highlight Internal Speakers / Headphones
    Make sure Mute is not enabled.
2. 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.
    I know you have tried this.
3. Reset PRAM. http://support.apple.com/kb/PH4405
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.
5. Reinstall OS X 10.6 Snow Leopard, if it is your current OS X.
Best.

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