New iMac is buzzing with power on or shut off

I purchased my new iMac on 4/26 and turned it on everything was great.  Let it go into sleep mode overnight and the next evening it was buzzing quite loudly, interfereing.  I tried shutting it down, still buzzing, power source removed no muzzing any more.  I know electronics have buzzing sounds but after having the computer shut off for 24 hours the buzzing went away, only to come back after the computer had been on for 30 minutes.  Is it possible this is just a defective machine?  If i exchange it will it happen again?  could the electricity in my home caused the buzzing?

No iMac should produce a buzzing sound.
Yes, it's possible there's a defect.
You have a one year limited warranty.
Check your warranty status here > 
Apple - Support - Check Your Service and Support Coverage
Standard return policy:
You have 14 calendar days to return an item from the date you received it.
From here >  Apple Help - Returns and Refund
You need to take the iMac in for service. Locations listed here.

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