Humming sound construction fault?

I've got a brand new 27 iMac Core i7, but it produces a low humming sound which only disappears when you lift it up!?
It's sounding like an old transformer and you can feel the vibration on the table.
So I sent it back and received a new one, which is making exactly the same noise and now I'm waiting for the third one.
But I doubt if that will do any good, in my opinion this is a construction fault and not just a coïncidance. I wonder if they do listen themselves when assembling this machine?

Hello
try to an other electrical plug ?
try to plug into an other place at home ?
plug only the imac on electrical plus no other devices ?
possible probleme with electrical ground ?
i know lot of question   but 2,  even may 3 computers do same default symptome ? i cant beleave it
Pierre

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