My iBook is a little over 5 years old. It has run perfectly until about 5 weeks ago. My hard drive failed, and failed so badly I could not access it to work on it. Disk Utility would attempt to verify, and quit saying it was too badly damaged. I installed a new drive and thought I was done. It worked great for the last few weeks. Then, yesterday, it was acting goofy and I had to force it to shut down (Force Quit apps wouldn't launch, so I held the power button until it shut down). When I restarted all I got was the blue screen. And when I start up in Target Disk Mode (see other post), the firewire symbol doesn't bounce and the drive does not appear on the other computer--even in Disk Utility. I suppose it is possible that my new hard drive has failed this early on, but I'm wondering if some other hardware problem could be causing this. Any ideas would be greatly appreciated!