I've had my G4 for almost 4 years now and have had no problem until today. My computer decides to freeze at the grey start menu with the Apple icon. The loading symbol does not appear anymore either. The screen will stay there as long as the computer is on, and it will go no further into the startup. I have been told that it may be that the RAM is not seated correctly. It may also be the Logic Board. What, if anything, can I do or have done to my computer to bring it back to normal? Will buying a larger size RAM or Logic Board fix it?