Screen randomly turned white!

I was playing Pac the Man X on my Powerbook earlier today as I frequently do when something rather bizarre happened. Pac Man suddenly froze, and my screen began to turn white. It stayed normal for a second after Pac Man froze, but the went to the white. I wasn't straight to white, but like a jumpy version of a fade to white PowerPoint transition (best analogy I could think of). I didn't notice anything out of the ordinary before this happened, and I have never had any trouble with Pac Man. I wasn't sure what was going on, which made me somewhat nervous, so I immediately did a force restart (command, control, power key). After the restart, my computer started up fine. I went straight into disk utility and backed up my hard drive onto my external 500gb WD drive (the new My Book Premium) just in case there was an actual problem. It would be rather devastating for me to loose my 7,000 song library among other things. Since the reboot, everything has been running without a hitch. The whole thing happened almost 6 hours ago.
Now that I have explained the problem, I will give as much background information as possible so everyone will know exactly what is going on. Last night (6/29), I downloaded the 10.4.7 update, the iTunes 6.0.5 update, the QuickTime 7.1.2 update, and the iPod updater 2006-06-28 all through software update. After the updates were finished downloading and installing, I chose the option for shutdown instead of restart and went to bed. This morning (Friday morning actually, 6/30) I started up my computer, logged in, launched mail and AIM, and pulled up my Dashboard. Before heading off to work, I closed the screen to put my PowerBook to sleep as I always do. I noticed that the sleep light did not come on at all, so I opened the computer back up only to be greeted be a black screen. The computer was still on and running, but the screen was not coming up. I moved the mouse around with no response. I then did a force restart, hit the shutdown button on the login window, and then left for work. When I returned home, I started up my PowerBook, launched Mail and AIM, poked around the iTunes store a bit (got the 2 free singles), and fired up Pac the Man X. After I had been playing for a few minutes, the white screen thing happened.
Now for the tech specs of my situation: I have a 15", 1.25ghz PowerBook G4. It has 1gb of RAM installed. I have a Logitech MX900 Bluetooth mouse connected wirelessly (obviously), as well as a 500gb Western Digital My Book Premium drive connected through the USB2 port on the left side. I also have a Sony 19" external display connected to the DVI port running in a dual screen setup. I am running OS 10.4.7 and had Mail, AIM, iTunes (not playing music), and Pac the Man X open and running at the time of the 'event'. I connect to the Internet wirelessly through my Airport Extreme Base Station. I do not know if the Sony display was affected because it was turned off at the time.
All right, I believe that that is all the information that anyone could ever need on my situation (and the most times I have used 'that' in a sentence). Sorry if it is a little overwhelming, I just want to make sure I cover all the bases. Is this a precursor to a major problem, or am I just being paranoid? What caused it? Has anyone else experienced this? Should I go ahead and have Apple look at it before my warranty runs out? I have really haven't had any major problems with my PowerBook and would miss it terribly should something happen. If anyone can help me here, I would really, really appreciate it. Also, if I somehow managed to leave out any necessary information, please let me know. I looked briefly but did see any similar posts; so sorry if this has already been posted. Thank you in advance for any help.
1.25 Ghz PowerBook G4 Mac OS X (10.4.7) 1 GB RAM

tianablakely wrote:
My iPod 4g is about 2 weeks old...
Take it back.

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