Two iMac's 24 inch make soft rattling-kind-of noise when turned OFF !?

Apple-helpdesk Holland has no records of this "complain":
Me and my colleague have bought a new iMac 24 inch two months ago.
When our Mac's are turned OFF they keep making a very soft continuously rattling-kind-of noise, even after a couple of hours being turned OFF.
The sound is NOT annoying, we just want to know if its normal and our Mac's won't quit working in a few months because of a defect related to this noise.
At the Appledealer there's too much noise in the shop to notice this sound.
My Mac (CTO 2GB) was shipped in from the East and my colleague bought hers three weeks later directly in the Apple-store.
Needless to say; we live in different houses. Neither of us have connected devices to our Mac's.(only the internetkabel is connected)
When we pull the plug out of the socket, the sound dissapears.
I think that it would be too much of a coincidence that we both have the exact same defect in our Mac, so probably there are other iMac 24 inch owners with good hearing who can confirm this very soft continuously rattling-kind-of noise when de Mac is turned OFF.
You really have to put your ear close to the top-ventilationsplit on the backside to hear this sound.
Please let me know if you hear this very soft continuously rattling-kind-of noise aswell !
Thanks a lot!

This is the PPC G5 iMac forum, you need to post to the intel forum HERE.
Good luck,
Miriam

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