hmm same thing happend to my comp, though my HD was salvagable so i didnt loose and files "per se" i only lost every single program i had on it, all registration keys, CD keys, IDs, everything got deleted.
I bought a new HD, problem solved, though im planning on hijaking our old G5 and cracking her open to see if i could upgrade her, im planning on re entering halo modding, since my black macbook isnt exactly gaming material (1GB Ram and an Intel GMA 950 integrated GFX)