Okay, I've only had my Powerbook G4 since October 2005 and for the first week I had it, it worked great. But ever since that first week, it has been constantly freezing. I have 1 GB of RAM and I think there may be something wrong with it. I've noticed whenever I click the Apple menu and choose "About This Mac" and it says I have 1 GB, my computer will freeze shortly after I start it up. But sometimes after restarting it 5-6 times, it will tell me that I have 768 MB of RAM, and my computer works fine. I haven't replaced the RAM either, it is the RAM that came with the computer. Hopefully this makes sense to someone and they can help me out. I've been holding off on taking to the Apple store to have someone look at it because I wanted to see if I could find anything out myself first. Thanks.