Odd sound from 24-inch LED in sleep mode

Hello. I got the new 24-inch LED Cinema Display about a week ago. Looks awesome. Noticed an odd sound though that comes from the display when my MacBook Pro goes in sleep mode and only then. It's not extremely loud but is high pitched and is emanating from the back, around the power cord connector. Anybody else noticed? Wondering if it's something I should be worried about and consider exchanging before it worsens. Any thoughts appreciated.

Thanks for the reply. I have heard that ticking sound. It does not bug me and is not the one I'm writing about. The noise I'm referring to is high pitched sound that comes from the back of the display, around the power cord, when the MacBook Pro attached to it has been in sleep mode for a while. Just wondering if it's a defect and I should bring to the Apple Store. Display is otherwise spectacular and functioning flawlessly.

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    org.virtualbox.kext.VBoxNetFlt          4.1.20
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    com.apple.driver.AppleAHCIPort          2.4.0
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    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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    I work on behalf of HP
    Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos Thumbs Up" to the left of the reply button to say “Thanks” for helping!

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