I am running OSX 10.5.7. Installed it several weeks ago. This morning, the computer was acting up a bit. For instance, in my wife's account, I couldn't access our shared iTunes library, getting the error saying it was locked. When I rebooted, suddenly I couldn't get into the machine. It just hangs on a blue screen. I've tried booting with the shift key down, and that didn't do anything. I also tried cmd-s, but don't know what to do with that at the prompt, and cmd-v, which works fine, but just dumps me into the blue screen again. I have a bootable FW drive, and I can boot fine off that, and even see the internal drive. I've opened files on the internal drive -- it all looks intact. But I still can't boot from the internal drive. I've tried Googling for solutions, but if you google "hangs on blue screen" or bsod or whatever around OSX, you get a bunch of hits related to installing 10.5.7, which isn't my issue, and you also get articles from 2006 and 2004, etc. which I am a little to reluctant to try their solutions. Anyone have any ideas on something like this? I was hoping it was some sort of permissions thing, but I am not really sure. Any help is appreciated.