Hi! My macbook won't boot up anymore, but instead get stuck on the gray apple screen with the spinning wheel. Specifically on executing FSCK_HFS with verbose mode. I let fsck_hfs in verbose mode run for a while, but it appears to be stuck on executing. I had it run for almost 9 hours, but it was still stuck. I ran verify permissions and repair, and verify disk and repair through disk utility to no avail. It won't boot up in safemode either. It will however boot up in ubuntu through a USB stick. I then ran fsck -fy in single user mode, which told me "The volume Macintosh HD appears to be OK. *****The volume was modified *****". I ran fsck again three times which now only says "The volume Macintosh HD appears to be OK." Rebooted, but still stuck at fsck_hfs Last session I used my macbook, I did numerous things, but there's one thing I did that I think has caused this to happen. I was deleting some junk files such as downloads duplicate files. I didn't know the password to all the users on the computer, so I changed users folders and all files inside to RW to everyone, so I could delete their junk files as well. I didn't delete any system files, only junk that is safe to delete. Is this why osx won't boot up? The other things I did on the last session was: install a Photoshop trial, uninstall unused user installed programs, run ccleaner to clear browser cache and stuff like that. I read this post: http://forums.macrumors.com/showthread.php?p=17338567#post17338567 which said that chmod ugo+rwx / might help, but I have to reinstall osx afterwards anyway to get the proper permissions the all the files. Sorry for being such a Mac noob. Thanks.