Dead Pixels, NOT FROM MONITOR

Hi,
I am (and have been for quite some time) running a Dual 1GHZ MDD G4 with a 23" Cinema display. I have never had any problems with dead pixels on the monitor before.
I just recently upgraded to Leopard, with no problems I could see. After using my computer normally for some time, I started it up from sleep to find that my monitor was covered in vertical columns of pixels that were seemingly stuck.
I verified that it was not the monitor, 1) by plugging it into my laptop--everything worked fine, and 2) I can actually take screenshots of the dead pixels.
I have never encountered anything like this before, the pixels are always in the same place, unless you move a window underneath them in which case the original pixels stay on the window, and duplicate themselves repeatedly as the window is moved (shown in the second screenshot I linked to.
Anyways, any insight into what the heck is going on would be much appreciated. Screenshots:
http://img504.imageshack.us/img504/1042/41489419bl2.jpg
http://img223.imageshack.us/img223/7171/21917416qz6.jpg

Try booting from either your original System disc or a Tiger/Panther install disc and see if the problem replicates. If it does, it's a hardware problem. Video artifacts like what is shown in your images usually indicate a failing video card - either the GPU or RAM on the card have overheated and been damaged.
-Douggo

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