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Question: Laptops sound keeps dimming?

(Posted by: on 2010-03-09 17:58:29)

When i watch videos on youtube, or listen too music, the sound on my laptop sort of lets say, Decreases and only goes back to normal when i move the mouse for a couple seconds or turn the volume up a smidge. what could be causing this? its a Compaq presario CQ60 its under a year old. running vista