IMac Screen has burn marks developing

I have a late 2008 iMac that up to now seems to be operating ok. But recently there have been dark spots occurring on the screen after the unit warms up. It's most definitely caused by heat because the spots on the screen are hot to the touch.
When I turn the unit off and let it rest, then reboot after a while, the marks go away.
Is this an Apple defect? Is there anything that can be done? In other words if I take it to the Apple Store are they going to tell me there's nothing they can do?

I don't b4elieve they'd tell you that they can't do anything; the point would be to find out exactly what issue is causing it and how much it would cost to replace that part. If your machine is a 2008 is getting to be +/- 7 years old which - with electronic devices - is very old. So you will need to determine if whatever fix they offer is worth spending the money on. And, after 7 years, it would be far too difficult to prove it's a manufacturing defect - rather, it appears to be simply parts wearing out after quite a long time.

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I have a late 2009 21.5 iMac.
Last night my friend brought his mid 21.5 2010 iMac here so I could upgrade him to Yosemite ( I have very fast internet).
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http://i49.tinypic.com/kd66wy.jpg
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Message was edited by: iBookUserUK

I have exactly the same problem on my 24-inch 3.06 GHz iMac. If I use Safari for a few hours the window burns in leaving grey colored lines. They will disappear if I turn off the display and leave it off for a few hours, but they come back very fast.
So I called Apple last week and they suspect my screen is defective. They asked me to take the machine to a Service Provider. I brought it in on Friday so I'm waiting for the result.
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Allan, the information is so confusing....
Indeed! That's why I editted out that part after having second thoughts and seeing your follow-up. The MacTracker database is pretty good about details but does not go into which iMacs have separate video hardware. From personal iMac exerience within the family, we jumped from a G3/400 to my mid-2010 quad-cor i7 27-inch without managing to own any of the intervening models!
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So my iMac is only 6 months old (and has 1 year warranty from when you purchase it) and it has lines and bloches in the top left and right left corners where it looks like its been burned.
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[img]http://lh3.ggpht.com/_JpnNPDWA9yU/S-V0oGHpFqI/AAAAAAAABPQ/PhCbquo7KYQ/s640/photo %20%281%29.jpg[/img]
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Water?? AFAIK, plain water dripping on the screen would not make that kind of damage, but I could be wrong. Is there any evidence of remaining water? Does anyone have access to the machine? I could only conjecture as to conspiracy theories, such as someone hitting the machine, and trying to hide the damage by dripping water on it, but that's pretty far fetched.
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IMac Screen has burn marks developing

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