Chirp Sound From Mac Mini

i just got a brand new mac mini a few days ago. it works great, but i noticed a faint "chirping" sound from time to time coming from it. it's not coming out of the speaker, it still happens when the sound is muted. i can't make it happen...just happened once every couple minutes.
i've seen people asking about this type of thing before, but i've never heard an answer. perhaps it's coming from the HD, which makes me concerned. any ideas?

here's my plan.
i'm actually thinking that a recent update (10.6.2?) made my mini start chirping. i don't think my HD or graphics card is about to fail...this thing is brand new. and i'm almost positive that it was not chirping for the first few days (before a bunch of updates were done). i think i'm going to ignore it until the next series of updates, and see what happens. maybe it will go away...if it doesn't, i'll probably take it to the apple store near me. i have the complimentary year of coverage for a while, so it shouldn't be a big deal.
it seems strange that a problem like this would be caused by a software update, but you never know. there seems to be at least two cases of this out there.
anyway, chime in if you are experiencing this. and zielvis, continue to post with your thoughts, and i'll do the same.

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