The screen will not display anything when I turn it on. Everything else seems to be working to my knowledge, but I cannot be sure since I cannot see anything on the screen. What could be the problem? I know that most likely the G4 CD's someone gave me with the computer won't work with a G3 ibook either right? I'm wondering if maybe I can just replace the screen with a working one and it will work, but I don't know. What are your thoughts?