My computer shuts off before booting into the OS. Tried running fsck and got this can anyone make sense of it? Also, is there any way to restore the OS (formatted for all I care) without a disc..and will that fix the problem? Heres the message I got; /dev/rdisk0s2 Root file system Executing fsck_hfs (version diskdev_cmds-491 .6~3). Checking Journaled HFS Plus volume. Checking extents overflow file. Checking catalog file. Invalid sibling link (4, 7543) Rebuilding catalog B-tree. Disk full error The volume Macintosh HD could not be repaired. /dev/rdisk0s2 (hfs) EXITED WITH SIGNAL 8 Anyone who can help is a friggin saint!