Blotches on the screen

I have an imac G5 20inch bought 2 months ago, and recently there has been a number of black marks appearing inside the screen. at first I thought it was dead pixels but its definately not.
It seems to be appearing on other parts of the screen. Is it dust getting in and getting trapped or is it something more serious.

Kelly -
Excellent suggestion!!!
If you can capture them on a screen capture what does that tell you?
If you cannot, does that tell you something different?
I read this thread because I just today began seeing some strange happenings on the monitor of my 1st generation G5 iMac 20".
First of all, after waking it from sleep, when I set to work I occasionally get a gentle screen shudder. To be more specific: ever enter the wrong password as you log in after logging out? The log in screen gives a major shudder. If I am working writing text into a document window, for example, I will get a much gentler - but still quite noticeable - version of that shudder.
Second: I have had one of my desktop icons look as if someone had taken an eraser to it and tried to rub it out. It was the icon for my iPod. You could not read the text under the icon; you could not identify any part of the icon. It just looked like what would happen if you tried to erase it.
Third: tiny, random, colorized segments began to show up on my screen. These are always about 1/16" high and maybe 1/4" long. If you "rub" over them with your cursor, they disappear.
What is going on here? Happily, I have a three-year AppleCare policy and several Apple Stores within an easy drive...but I'd love to solve this problem with advice from someone here.
Many thanks,
bob

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