IBOOK G4: Stuck on gray screen, no display...please help.

Hello everyone,
I need help with my IBOOK G4. I have power and I hear the fan and the start up sound, but it gets stuck on the gray screen with the apple in the middle and the circle spinning. I am trying to use the software restore and install disc to start it up and it won't read it. I turned it on and help down the power button and the "C" key and it still gets stuck on the gray screen. I am not concerned with saving any data or software, I just want it to turn on. Anyone have any other suggestions?
Thank you.

I'm probably grasping at straws, but can you start up in Safe Mode (Safe Boot)? Press down the shift key from when you hear the start up chime until you see the words "Safe Boot" in red letters on the log in screen AND keep pressing it until you click on the Log In button. It may take a very long time as Tiger will be scanning your hard drive for problems. You should also have all your peripherals disconnected. If this works, you will disable a lot of things that might be causing problems and have a chance to look for the cause of your problem.
If you can get on using safe boot, please post back for further advice. I am not an expert on safe boot, but I do have a good book I can consult. And with luck, one of the more experienced and knowledgeable members of the forum will step in and help.
Good luck!
Good luck!

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