Screen becomes pixelated and scrambled

Recently my screen has becoming pixelated and scrambled. The more I move my mouse, the worse it gets to the point I can't see anything at all. If I safe boot everything works fine, but every time I boot normally it happens.
Any ideas?
Here's my specs:
iMac 20"
1.8 Ghz Power PC G5
1.5 GB DDR SDRAM
OS X v10.5.8

There is lots of info on the web! I have had lots of luck with repairing these machines! Just remember the better the capacitor you use the longer they last! High Quality low ESR High temp Caps! Also while you do the motherboard you might as well replace the caps in the power supply to they also fail! Chech here for both! http://jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php

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Screen becomes pixelated and scrambled

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