I simply can't afford a new Macbook and my old iBook G4 is getting very sluggish. I've cleared off a load of files onto an external drive but is there anything else I can do? I'm currently running OS 10.5 and was wondering if I can put more than 768MB RAM in it. My friend has an old, broken PowerBook G4 with 2GB - can I use that RAM? Any help, ideas or suggestions appreciated. Also, why is the Model Identifier "PowerBook6,5" when I have an iBook??