Checkered / Block Screen Problems. What should I do?

I have had my iMac G5 w/built in iSight for quite a while now and suddenly my screen has become quite erratic. The screen begins with just finder items such as the top toolbar, the dock, and application switcher checkering and then the entire screen starts to become checkered. This does not happen gradually, but suddenly. When first turning on the computer this block problem is not prevalent, but after a certain period of time the problem becomes visible. I don't know if this is an internal problem or what but I would like to know what I should do. Please see pictures posted below of my problem and hopefully somebody can point me in the right direction!! Thank you very much
http://i255.photobucket.com/albums/hh128/chapwag1001/Picture1.png
http://i255.photobucket.com/albums/hh128/chapwag1001/Picture3.png
http://i255.photobucket.com/albums/hh128/chapwag1001/Picture4.png
http://i255.photobucket.com/albums/hh128/chapwag1001/Picture5.png
Thanks in advance!

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Checkered / Block Screen Problems. What should I do?

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