Mac stuck at Gray apple screen that turns red, green and blue.

A month ago I was playing world of warcraft on my powerbook when the entire screen froze up and pixelated. I forced shut down and powered it back up. Now I only get the gray screen with the apple and the spinning wheel. The gray screen changes color to blue, then green then red and lines flicker horizontally up and down my screen. After a minute the little wheel stops spinning. I have tried all of the various resets, booting into safe mode, hooking it up to an external monitor and none of those options worked. I booted into target disk mode and ran checks on my hd and it is fine. If I try to boot from my installer cd the screen just goes gray. Do you think this could be a sign of logic board failure?

Welcome to the Apple discussions.
Sorry to hear about your system. You've done some good troubleshooting, however, I'd suggest you take it to an Apple store or Apple Authorized Service Provider, to get their take. It does sound likely that the logic board has issues. You can find the closest store/provider at http://www.apple.com/buy/locator/service/ . Assuming it is a logic board issue, you can buy and replace it yourself, however, it is very involved. You can see how to do it at http://www.ifixit.com/Guide/Mac/PowerBook-G4-Al-12-Inch/Logic-Board/53/16/

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