My TI 800 started acting like a PC with Windows 98 a few months ago. Applications started to hang and lose stability. Repairing permissions always hung about 3/4 of the way through. I ran FSCK and received the "keys out of order" message. When I spoke with a genius who just happened to be in the room, he stated that the "keys out of order" message indicates a fatal hardware error, and my 5 month old hard drive should be replaced before it died. According to the genius, Apple had a bad run of drives and they were replacing them without question when keys where out of order. I would not bother with Disk Warrior or any other diagnostic tools - talk to Apple. Noele