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Mine does the same thing. Keep in mind this is an "All-In-One" computer therefore the monitor also contains the hard drive, motherboard, memory, fans, etc... I believe that humming we hear is the hard drive as it spins at 5,400 revolutions per minute.
Sorry, there was a problem. Please try again later.Mine did and then I figured out it was against my external hard drive. Once I moved it it stopped.
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