Imac 2012 making feint ticking noise?

There is a feint ticking sound coming from the bottom of the apple logo on my imac 27. it dosen't sound threatning, but it dosent sound like it should be making this noise either. when i switch to bootcamp and use windows, the ticking sound goes away and everythings quiet. it only turns on if i am using apples osx mountain lion. anyone know why?

Hi, does it sound like Hard Drive activity?
Maybe Spotlight faoling & constantly using the drive?
Open Console in Applications>Utilities & see if there are any clues or repeating messages when this happens.
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts (Users & Groups in later OSX versions)>Login Items window to see if it or something relevant is listed. Or an errant process eating up RAM.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons

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