Dark lines (horizontal) on the monitor (24", late 2008)

Hi all,
I have 2 noticeable horizontal lines (grey-ish) on my iMac's monitor. I don't think these are the result of an old image being 'burned' into the screen, as they still appear after leaving the computer off for a number of hours. The lines aren't captured by a screenshot so I assume it's a problem with the screen/graphics chip rather than anything else.
Does anyone know what the problem could be?
Many thanks,
Tom

I presume/hope that you have AppleCare.
I suspect that your video card has problems.

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