Does your 21.5-inch iMac creak when you turn it on?

I have a Mid 2010 21.5-inch iMac. When I wake it up, having left it in Sleep mode for a few hours, it creaks and pops. These sounds clearly come from inside the iMac, so I would imagine they're the sound of the metal (or perhaps plastic components) heating up and expanding as the computer warms up.
Has anyone else noticed this with their 21.5-inch iMac? The sounds are actually quite loud, and not at all subtle or easy to miss.
My iMac didn't do this back in November 2010 when I first got it, but it does now (May 2011).

Hi Reuben,
Could it be the Superdrive noise, or is it separate of that? I have noticed that this iMac's drive makes a different sound upon wake-up than my older iMac or my newer MBP. The mechanism is clearly different in the new one so the sound is different as well. Just wondering if that is the noise you are hearing or if it's in addition to that...
Mike

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Does your 21.5-inch iMac creak when you turn it on?

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