It is unclear what you mean by "Can I fix it?". "Is the actual problem with this iBook G4 something that can be fixed by replacing hardware?" Maybe. Most of the time, people who see this particular symptom -- a blinking question mark folder -- have perfectly functional hardware. If you are lucky, you are one of those people. If so, you can fix the real problem, that gives this particular symptom, without any hardware modifications. Have you tried the ways of fixing this particular symptom described at: (1) "A flashing question mark appears when you start your Mac" http://support.apple.com/kb/ts1440 (2) "What should I do if I get a white screen with a folder with a question mark when I start my 13" Macbook Pro?" https://answerqi.com/asq/299/answermail/...-should-i-do-if-i-get-a-white-screen-with-a-folder-with-a-question-mark-when-i-st (3) "MBA displays the Question mark Folder on booting up" http://apple.stackexchange.com/questions...-displays-the-question-mark-folder-on-booting-up (4) "A flashing question...