I'm on a Macbook os x, last night after I powered off my mac; when I went to start it up again, it was stuck on the apple loading screen. After about 15-20 minutes, it just powered off on it's own. I've tried all the suggestions in related posts: starting from a cd - I got to disk utilities, whereupon I attempted a disk repair on my Macintosh HD. It couldn't be repaired, rebuilding btree failed. I tried through terminal as well and it gave me error I/0 invalid node structure (4, 12585). And same via single user mode with fsck. If I owned another mac, I'd certainly try through FireWire however I don't. All I have is an hp desktop that doesn't connect to the Internet. At this point I don't think there is much else I can do to resolve this problem, is there? At the least, I'd just like to retrieve the photos of my children, I haven't backed anything up. Ugh. I'd like to avoid taking it in, seeing as how my warranty is expired. Anyone have advice?