Hi guys. First poster here, but I've been Googling, and I can't find a case like mine... A month or two ago, my harddrive crashed and my warranty covered me for a new one. Note: I have the latest generation that was Tiger OS, but after they changed my harddrive, they installed Leopard. Info is probably irrelevant, but might help. Going on, this new hard drive is seriously giving me a hard time. Safari crashes a lot and %50 of the time, I have to hard-shutoff (plug the plug) because it won't let me shut down. It was probably because I never installed any of the updates. So, I install all the updates and it tells me to restart, but again, my computer won't let me "shut down" or "restart" so I hard-shutdown and went to sleep. Next day, I turn my computer on. I see my icon and I put in my password, it takes me to the "register your computer" process. Okay. I register. It takes me back to the login, and then I have to register again. It's repetitive. What do I do? I literally have no time to go to the Apple store to get this replaced. I am on a full schedule back to back. I tried explaining this to the best of my ability, I hope you guys can help. If I left some details vague, I can try to explain it again. Thanks!