I have a question regarding adding memory to my daughters 3 year old I-Book G4. Bear in mind we are not tech savvy. Under "System Profiler:Memory" it says: Memory Slot: DIMMO/BUILT-IN 512mb status Ok DIMMI/J7 Empty She needs more memory to be able to install the driver to use an external hard drive. She only has 11mg left and it takes about 26mg of available space to install it. Unfortunately, she has several itunes audiobooks on her computer that she has paid for and doesn't want to get rid of, so we can't create space that way. Is there a way to add more memory so we can get the audiobooks onto an external hard drive? Thanks!