So this morning, the sound on my MacBookPro was working perfectly, but then all of the sudden, the sound didn't work. When i turned the volume up, it showed it turning up, but there was no noise. I also tried plugging in my earphones, and it still didn't

So this morning, the sound on my MacBookPro was working perfectly, but then all of the sudden, the sound didn't work. When i turned the volume up, it showed it turning up, but there was no noise. I also tried plugging in my earphones, and it still didn't work. I don't know what to do!!

Go step by step and test.
1. System Preference > Sound > Output > Internal Speakers
    Highlight  Internal Speakers / Headphones
    Make sure that Mute is not enabled.
2.Plug in and  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.
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.

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