I keep getting a black screen that says hold down the restart button

I keep getting a black screen that says to restart my Mac G4 1.4 Ghz. I'm using OSX 10.4.2 The black screen tells me to hold down the restart button. Anyway pressing the start button doesn't do anything. No response using the button on the front of the Mac either. This just started today. I end up having to unplug the Mac. If I start it with the option key held down and choose my OSX disk, the one I normally use it real let me log in as usual. I've repaired disk permissions. Came back to it again a few hours later started the system up it did the same thing.
Does anybody know what's going on? What this behaviour means?

Hi, David. Welcome to the Discussions.
You are describing this message, which indicates a kernel panic.
See my "Resolving Kernel Panics" FAQ. This FAQ includes step-by-step instructions for identifying and resolving some of the most common causes of kernel panics. The FAQ is a roadmap: start at the beginning and work systematically through the end, i.e. the "If all else fails..." section.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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