Humming Sound

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Question - Jock, Boston, MA, February 09, 2010, 23:06 When drive off i notice that there is a humming sound, but as the the automatic changes to another gear it stops. Again when the car moves on a snail pace the same thing happens, and as it pickup speed it goes away. This sound also comes when i moves the steering to take a turn. Could it be that my power steering fluid is low or what can it be?