Strange clicking noise coming from iMac 24"

[method]

I have this constant clicking noise coming from the bottom of my iMac 24"

The noise begins when I turn the machine on, and wont stop, until I turn it off. It is a constant clicking, with no audible change in loudness, just a constant clicking.

I've done some research and the descriptions of the noise are unspecific. I have recorded what my noise sounds like in hopes of figuring this out.

I have tried enabling the Energy Saver option "Put hard disks to sleep when possible" but that didn't work.

Attached is an .m4a of the noise, it is 3 seconds long and kind of quiet but its there.

Thanks in advance for any help!

[cpjr]

I would say its the harddrive.

[velocity211]

Sounds like my hard drive a week before it died. I'd backup all the data if I were you.

[alexk82]

you better back that up. the new imac have a notorious reputation of having load harddrives, but that sounds like a dying one