Macbook Pro and high-pitch sound, please help!

Question

Hello,
     I have a Macbook Pro 13 inch that is almost brand new. I just got it 3 months ago for my birthday. About a month or two with my new computer I started hearing a high-pitch sound comming from the computer. The sound only lasts about 3-6 seconds and it goes of at random times. It might make the noise 5 times in one day but then it might go away for 3 days, totally random. The sound comes if the computer is sitting there or is being used. After about 3 months of this going off I deceided to bring it to the Apple store in New Haven, CT. Does anyone have the same problem?
     After bringing my computer in and telling them the problem, they tested in for about 30 minutes. Everything was fine. No fan problem or hardrive problem. I brought the computer back home and within 3 days the sound is back. I drove to the Apple store again told them my problem,again, and they did they same test with no results. Brought it back home, noise is still there. This time im starting to get angry, they arent offering any solution. I bring it back and they take it for about 48 hours and do a extensive check. Nothing was found. I bring it home again and the noise is still there. My father and I went to Apple pretty angry and told them that we appreciate the time they take but something really needs to be done. They have sent it out for 3-5 days and we are awating a phone call to see whats wrong.
     I am hoping that they find something or if they dont can they can replace my computer? I am not spending hours of my own time and gas money going back and forth to Apple for no reason..the Genius bar guys have been no help telling us basically that we are lying and that there is nothing wrong when clearly there is. What can I do? Has anyone had this same noise come from their computer? I really appreciat everyone that decideds to throw some input in. Thank you so much.
Notes:
I have the latest software
Macbook Pro 13'
No physical damage done
Alex Cartier

Answer 1

Make a recording of the sound so the next time you take it in you can let them hear it. It might be best to do a video of the unit so the sound is combined with pictures/video of the computer so they know  the sound is coming from it.
IMHO the guys at the B-bars are just about useless for this type of thing. If it isn't a bad drive, HDD or DVD, and the system seems to run OK (actually even if it doesn't run OK but runs at all) they will say "Everything looks OK". Or if the thing is dead they can help. That help will be "You need a new HDD" "You need a new DVD drive" "You need a new Logic board" and that's about it.