When playing music through the audio port on my macbook pro only the left speakers/headphones work. external speakers are fine!

I am having problems with the 3.5mm audio jack on my mac book pro. its been just over a year and now when i connect 3.5 headphones or speakers they only play the left speakers. the right speakers do not work.

If you go to System Preferences (from the Apple menu) > Sound and select Output, how is the Balance slider set? If it is all the way to the left, put it in the middle.
Best of luck.

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