Noises behind screen

Every now and again there is a slight 'pop' or 'click' sound behind the screen of my iMac G5 17". My friend thinks it is because of the screen expanding in temperature.
Is this normal?

Daniel,
..I hear the same thing occassionally, particularly early in the AM when my office is cold and I've "awakened" the iMac.
Yes, I strongly suspect it is simply the clear acrylic shell contracting/expanding. Take a close look and you'll notice that the body is comprised of two primary pieces; the front screen-side piece snuggly fitting over the back piece sort of like the lid on a tuperware bowl. If you carefully (not too much pressure) squeeze the two pieces together with your thumb and forefinger, you can sometimes reproduce these very same clicks/pops. IMHO, they're nothing to worry about.

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