Strange images on the monitor. How to fix?

Hi guys. I have an iMac G5 running 10.4.11 that refuses to boot properly. The first problem that we found was with the power supply, we replaced it and even though the computer now actually receives power, it has returned to the previous problem. Currently when the computer is started up, we hear the normal startup sound but the screen remains dark. After a few seconds, the monitor begins to show something, but all it shows is that the left third of the screen is blue with little weird streaks through it, like if somebody tried to draw straight lines but somebody else moved a some of the pixels up or down, resulting in a fragmented line thing. After about a minute of this the left third of the screen changes fast into a crimson color right before there is a large white explosion of color across the whole screen. After that the third of the screen is pink, and the entire top border of the screen constantly flickers. And then, after a minute of this, the fans turn on at full blast.
I have checked the logic board and all the capacitors appear to be in perfect condition, while the power supply obviously had problems. So my question, is there anything else I should try? I really do want to get this fixed rather than buy a whole new computer.
Message was edited by: Emilio527

If you have not already, reset PRAM
http://support.apple.com/kb/HT1379
and if that does not help, reset SMC (power management)
http://support.apple.com/kb/HT1767
Be sure to follow the procedure precisely and disconnect all cables. When you re-connect it, if you are using an over-crowded or old power strip (surge suppressor), you may want to connect it directly to the wall outlet, at least initially.

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