IBook G4 with graphics weirdness, possibly overheating?

I have an iBook G4 that's about two years old. It has been fine up until a couple of months ago. Now, after about fifteen minutes, the screen display starts to break up with static, lots of different colors, etc., flickers, and then goes dark.
Sometimes closing the lid and re-opening it will fix it long enough to shut down or restart, but not always. Usually letting it go to sleep and "rest" for awhile will fix things, but only for about fifteen minutes, when it happens again. It also seems to have something to do with how much processing power I'm using, i.e., if I'm using memory or graphics intensive applications.
My feeling is that something is getting hot, but I don't know what. I don't know that it matters (I'm going to have to have it repaired or replace anyway, and I can't fix it myself), but has anyone had problems like this that they've successfully fixed?
Thanks!

I had a similar problem with an iBook G3. It was a common problem with the G3 800 where the video card located at the front left would come away from the motherboard. The problem could be brought on by people lifting them by the front corners. Many had the motherboards replaced under an apple replacement plan as they admitted the motherboards were faulty in this model. Mine was 3 years old and was out of their time limit but I was ready to replace it anyway.
You might try searching apple to see if they are doing similar with this model.

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