Problem with sound when plug in headphones


i bought 15" mbp last week , got few apps installed on machine. , looks have problem sound. when use built-in loud speakers, totally fine. when plug in headphones. left 1 bigger right one. check sound configuration, balance put right in middle (for both built-in loudspeakers , headphones). therefore, have put 3/4 on right headphones. don't know happening mbp.

please me, believe there conflicts between installed software drivers or something, since happens both mac os , windows 7 (boot camp), guess wrong then.

appreciate lot.
 

hmmmm.... pretty weird... have tried headphones off source? have tried other headphones or speakers? perhaps headphones have problem... :confused:
 


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