High pitched whine comming from right monitor ( Alesis Elevate 3)

Could someone please help, I'm having a problem with some just purchased monitors. A high pitched cricket type sound coming from the right powered monitor. I've tried plugging in just the right monitor to just the power, with no other connections to the pc and still this is no help. If i plug headphones into the headphone input on the monitor this pretty much removes the high pitch sound. Does it sound like they are faulty?
thanks.

Shane
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