Cannot get internal speakers to work. Only works with headphones or external speakers?????

All of a sudden my MacBook Pro internal speakers are not working. The status bar at the top of the screen shows everything bold and in black print but now the speaker volume symbol shows just the gray color and will not allow me to adjust the volume. However, when I plug in headphones or external speakers the symbol becomes bold and black the way it should and everything works just fine??? How do I correct this?

Go step by step and test.
1.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.
2. Reset PRAM.  http://support.apple.com/kb/PH14222
    Do this twice
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".
Best.

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