Macbook Pro Emiting hifrequenchirp, buzz noise,how ever you like to call it

Hello friends!
when the battery of my macbook pro is fully loaded it emits a hi-frequent noise from the left where the magsafe connector is connected.
The sound is also hearable in batterymodus, but very soft.
Disabeling one CPU stops the noise.
Is it normal that the left fan is continously running at slow speed and produce a hearable blowing sound which is slightly louder than the hdd?
I got it in december last year .
Anyone noticed the same ?
That buzz is very annoying ....
Best wishes
Marc

Some people are more sensitive to these noises than others. I for one have noted similar noises on my Powerbook G4. Some noises are normal, others are not. Your best be is to keep your data backed up in case the noise turns out to be an out of sync hard drive, or a fan that is so out of sync it doesn't cool your hard drive enough. Run the hardware test that came with your machine and check the firmware updates to make sure your firmware is up to date. If neither is applicable, you can still call AppleCare and find out if they have a place where you can go that a technician can listen to the noise and find out if it is normal. I find many an Apple retail store are so noisy from the iTunes music, that I wouldn't believe that a technician could hear it there because it takes me a good half hour before my full hearing is restored after leaving the store.
Here are some links relevant to the above:
How to run the hardware test - http://docs.info.apple.com/article.html?artnum=303081
Firmware updates - http://docs.info.apple.com/article.html?artnum=303880
Let me know if you need help learning how to backup your data?

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