Any home-based to very noisy IMac?

I have the 24" new Imac. After a few days, it started getting very noisy from the bottom of the display. It's a whirring sound or a buzzing sound. The only way to get the sound off is to put the computer to sleep. The sound goes off after a second or two. Then when I wake up the computer, the whirring gets very loud for two seconds, like a lawn mower. Any thoughts?

charnovitz,
Start taking meticulous notes about the situation. Date/time stamp, noise, duration, cessation, etc.
You will soon be collecting on AppleCare. I have empathy.
My new shiny 24-inch iMac is dead quiet.
,dave

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