Weird imac sound is this hard drive or super drive?

hi I have this weird sound in my Imac and I was wondering why I keep on hearing this sound most of the time.
does this something to do with the hard drive? or the super drive? or both? or none?
I have tried resetting PRAM but the sound is still here
Does anyone have the same problem with mine? Any help on what to do to make this sound disappear?
like what troubleshooting do i have to do if applicable? this sound has been bothering me for months
my imac has a built in super drive
this sound is appearing randomly and frequently
I hear this sound even if my imac is in mute
here is the video
http://youtu.be/dI1m5VAxp8A
thank you very much

If it is 2010 imac it should boot into Apple Hardware Test, without the install disc if it has been upgraded to firmware version 1.8.
See if it generates any errors....
How to reset SMC and PRAM: SMC and PRAM Reset
About AHT: Using Apple Hardware Test

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