Wonder if the "something" broke off or the fan stopped working???
What no I turned it slowly and carefully. It's completely fine, clicking or no clicking its such a delicate problem. I guess it happens during shipping when the iMac is moved and tilted. Some cable comes closer to the fan
When you say you tilted it do you mean you pivoted it on the stand?
No I leaned it to the side while holding it and while its running. All the way to the table. The sound disappeared for me then. I expect the fan inside the Mac has a couple of cables very close to the fan. The closer they are the more prominent the clicking sounds. So probably during shipping the cables moves a bit and comes too close. Just my theory though