Imac 27 inch starts chirping/electric buzzing noise after sometime

Hi,
I just got a new Imac 27" Late 2013 in December. But last couple of days I am expereincing some weird noise from Imac's backside. The noise starts after few minutes of usage. This sound is like chirping/eletric buzzing. I dont know why is this happening. Can you guys please help me with advices??
Its under warrenty, if something has gone wrong what will it be?
Thanks a lot.
Regards,
Vinay

Hi,
Please do not waste your time. Take it to Apple care for the diagonsis. I took it last week and have found out that IMac's Power supply unit has gone bad. They need to replace it.

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Imac 27 inch starts chirping/electric buzzing noise after sometime

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