Computer loosing itself in a crazy way

I have a Power Mac G4 AGP,450MHz,384 MB running OSX 10.3.9 that will intermidiatly bring up a dialog box in the center of my screen (with a different background) that shows many different languages and a message that I need to press and hold the startup button to shut down the computer. Sometimes it does this while I am working but for the past 2 nights it did this sometime after I logged out. I leave the computer running at the log in screen all the time so it can get backed up but no backup runs and this message is on the screen the next morning. What is going on?
G4   Mac OS X (10.3.9)  

From what you describe, I believe you are getting a Kernel Panic, which is usually a hardware problem. See these sites.
http://www.macmaps.com/kernelpanic.html
http://www.thexlab.com/faqs/kernelpanics.html
Cheers, Tom

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