Currently Being ModeratedFeb 16, 2013 9:08 PM (in response to Mirubiri)
Welcome to the Apple Support Communities
If you have an iMac with a HDD, probably it's the hard drive (a clicking noise is often caused by the hard drive), and it may indicate that your hard drive is going to fail.
I suggest you to make a backup of your data with Time Machine and/or Carbon Copy Cloner, and then, take the Mac to an Apple Store or reseller to get the HDD replaced
Currently Being ModeratedFeb 18, 2013 9:32 PM (in response to mende1)
I have uploaded an audio record. The sounds seems to increase when i put the mic near of the airsource in the back. Could be a power supply issue?
Currently Being ModeratedFeb 18, 2013 11:01 PM (in response to Mirubiri)
Maybe, but if it's a mechanical noise, it's probably the hard drive. However, you will only know what's failing if you take the Mac to an Apple Store or reseller
Currently Being ModeratedApr 12, 2013 10:34 PM (in response to mende1)
I finally sent my imac to the technical service for repairing, and the noise is still there. They merely returned it to me the next day they diagnosed it withouth touching it (as noted in the report, the only reseted smc, something that I did by phone when i call him). They could at least call me for asking about the problem.