Strange noise on wake/power on

Hi everyone,
After about 2 months of usage I noticed that my rMBP emits a wierd, spin-like noise from below the right side of the keyboard when waking from sleep or on power on.
I've uploaded a sample I recorded with my iPod: https://drive.google.com/file/d/0BwWAoQidwCwbWGtYUFpjZF9FQ1E/edit?usp=sharing
Please turn on your volume when listening the sample as it's a bit low and the sound only lasts about half a second. You can hear it at the beginning of the file.
Possibly the problem was present on purchase, but the first time I've noticed it was a few weeks ago.
Is this noise normal? Anyone else had a similar experience?
Thank you!

Thanks for your reply Barry,
I also suspected the fan, as there are no other moving parts in the computer.
It seems strange though that it always starts with a loud spin regardless of temperature.

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Message Edited by RunenBlut on 07-07-200709:34 AM
Message Edited by RunenBlut on 07-07-200709:37 AM
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