2.16 iMac display making popping noise

Hey guys,
My imac display has been making these "popping" noises that are very faint when the screen dims and when the screen goes to a screen saver (it does it for all different screen savers).
Its like a ticking sound and theres about 3 ticks per second.
The screen is as bright as ever so I'm not sure whats up. I'll leave the screen idle for a few mins, then it auto-dims and the ticking starts.
Anyone ever hearad of this?

use ASP and check the ST hard drive ie Seagate. If assembled in china and firmware version 7.01 ; then you best save your data asap because the hard drive is going to crash with no possibility of data recovery.

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