Hi, I'm new to the G4 powerbooks and don't really know much about them. I'm mostly a PC user but I use to own a firewire G3 powerbook. I really love apple laptops and am looking at buying a used G4. My main question to you is which of the powerbooks is the most stable and reliable? I've heard the early generation (400mhz) have cd/dvd loading problems and some of the g4's have problems with the screen hinges? Also what's the end user result of apple changing from titanium casing to a aluminum casing? Thanks, feel free to inforrm me on anything else I might of missed!