Hi everyone... Someone has got to help me with this... I'm going insane!! My Mid 2010 iMac (Quad Core i7, 16gb Ram, 2TB HD) is making what can only be described as the sound of water dripping every 12 seconds, sometimes every 6. It's very quiet... but you try working with that for any length of time in a quiet room and you'll soon be considering smashing the screen with your face! As I type this now the sound is happening exactly every 12 seconds. I had AppleCare on the machine which ran out in October... so towards the end of the cover I thought "I'm going to get this sorted" - so went into the store, got a bemused look from a Genius and they took my mac away for (I think it was) three weeks and did the following: Replaced the iMac's Power Supply Replaced the iMac's Hard Drive Replaced the iMac's LED Backlight (screen) I brought the Mac back home set it up and thought the noise had gone... but no!!! The following morning "drip" "drip" "drip" So I left it a while and booked another appointment, the Genius told me "everything that could cause this noise has been replaced... there's nothing left to cause it" So I said "Well actually, that cannot be true as I'm still getting the noise" And he then said that they would replace the LogicBoard as a sign of good will, but he didn't think it would make much difference. So they took my iMac for another 2 weeks and: Replaced the LogicBoard Replaced ALL of the internal Fans I got the iMac back home... set it up and wallowed in the bliss of my noiseless machine... ..."drip" ..."drip" ..."drip" WTF?!?!?!? It's back... it's happening right now! What is "The Drip" surely now there IS nothing left that could cause it??? I've even changed the power lead out of desperation!! It's not the speakers because I've connected it to a firewire audio interface and it still does it. It's not something to do with my house as I've moved while I've had the problem and it carried on!! The sound seems to be coming from somewhere on the lefthand side of the iMac. I'm starting to think now the only solution is to sell it and look for another one?? Can anyone help??