I got the iBook G4. Whenever I view OT or whatever (with heavy pictures), my computer gets super slow. The screen does the spinny rainbow ball for like 5 minutes to load one page. The internet stream is good. Could it be my weak 768 RAM or my OS version 10.3.9 or my 1.2Ghz processor? (Issue occurs with all browser: Safari, Firefox, IE). And side question, how do I upgrade my OS without a DVDrom?