my powerbook g4 titanium hard drive was makin weird noise and then it died and I can't get into operating system. now when I power on my laptop it only shows now a square with a smile face and a question mark. if I buy a new hard drive on ebay how do I install the OS on the hard drive? is it hard? will I be able to install it by myself? is there a website with the steps how to install the OS? when I buy the harddrive can someone HELP ME OUT PLEASE?