no wisecracks that it means we spent good money for nothing, etc please.....
we got a new iMac a few months ago.
Yesterday it started making a weird noise - like there is a small timer ticking away rapidly inside. Seems to be emanating from the left area of the monitor, and it is quiet when the computer goes to sleep.....it starts up again once you reactivate the screen
no other issues or symptoms we can see other than that.