Imac 27" brief mechanical ejection sound from dvd drive when booting up

Hey guys,
Had a quick question. I'm on my third 27" stock 3.06Ghz imac that was replaced yesterday. The good news is that so far it doesn't seem to have any of the problems of my previous two 27" imac's.
There is one thing though. A couple of seconds after pressing the power button to bootup there is a brief mechanical sound from the dvd drive like a quick ejecting sound even though there is no cd in the drive. My first 27" imac dvd drive made the sound but the second imac 27" Imac I had didn't. Is this sound normal? Would be curious to know why two out of the three 27" Imac's I had make that noise.
System profiler says my dvd drive is a:
OPTIARC DVD RW AD-5680H
Would be nice to hear from other Imac 27" owners to see if they have this sound. Peace of mind I guess. Thanks in advance!
Message was edited by: imjoshmac
Message was edited by: imjoshmac

Roger, et al,
Thanks for the prompt responses.
I ran Software Update, but I was already up to date, so there was nothing new to install.
The drive seems to be working fine. I used it to load lots of programs, made some big iDVD videos, and made a DVD of some Quicktime movie files. I can live with this startup sound, but I asked the Apple tech about it and she's the one who flagged it as a more serious problem. So unless someone can steer me in the direction of a home cure, I guess I'll take the young 'puter to the doctor.
Matt

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