Sound problems on macbook pro!?

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i have macbook pro , has started having problems sound! problem if press raise/lower sound buttons, sound stays same. gets temporarily fixed if restart computer or reset pram, problem starts again. sound fine until take out headphones , problem starts again. took apple store , looked @ it, problem came when got home. volume icon @ top never changes anymore, if lower or raise volume. have no idea going on becoming increasingly frustrating restart computer if want watch video. have not been running new programs or affect sound. know happening? if forever grateful!!!!
 



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