Display turns off when booting from CD

I have a 15-inch Powerbook. I need to reload the OS because my son changed the password and I need to reset it. But when I press "c" at the startup, the screen goes black. It does the same thing when I try to load open firmware at startup. Any ideas of how to fix this issue would be greatly appreciated.

Thank you soooo much! Pressing the command button launched the startup manager, where I was able to choose to start from CD manually. I didn't know about startup manager. Thanks again.

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