No stereo effect

In my MacBook Pro  apr 2012 ,  i am not able to get Stereo Effect in  the Song , the left and Right PAn works but if u play it will be mono and i have plugged in stereo Headphones and 2.1CH speakers , still the output is MONO . please give me the Solution for this .

Try Reset PRAM   http://support.apple.com/kb/PH4405
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".
If these steps do not help, you may have to contact Apple.
Best.

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