Screen gets blurry and then message

HI.
I was recently give a imac. It is a G4 - 1.8Ghz. It starts up fine and works for a little bit and then all of sudden the screen starts to get pixelated and everything hangs and then a message pops up and says that I must restart the computer. I read some stuff about it being a panic kernel but no mention the screen going wonky when that happens. I reset the pram, reset the firmware, and did a file system check on start up. Nothing seems to work. I even tried to do a disk repair but when it starts - it goes crazy again and the message comes up.
Is this fixable? Any ideas on how to fix this?
Thanks in advance.
L

Here is an excellent article on resolving kernel panics:
http://thexlab.com/faqs/kernelpanics.html
I was recently give a imac. It is a G4 - 1.8Ghz
The iMac G4s were never faster than 1.25Ghz. Is it possible you have a G5 iMac like this:
!http://images.apple.com/support/images/heroimacG5isight.jpg!
The most informative way to confirm a Mac model is to do "About this Mac..." from the Apple menu and, in the resulting window, click the button labeled, "More info...."
System Profiler opens to a "Hardware Overview" window whose first few lines absolutely identify your model.

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Screen gets blurry and then message

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