The other morning, my computer froze, and i restarted it, only to be greeted by the flashing question mark folder. I tried resetting the PRAM, resetting the VRAM, booting and holding alt to select my HD, even reseating the HD inside. Nothing worked. I put in my LION OS install DVD and had it repair the disk, which it could not do, and it said that the disk needs to be erased. I tried to erase it, but I got an error message after a bit that said "File System Formatter Failed". I don't know what to do. I have a backup of all my files on an external. Do I need to return the HD? Is there a way to heal it? Help!