ok i did something to crash my computer.... well more like stalled it i tried a force restart but then it go stuck on the grey apple screen. and on the top was these letters and numbers sh-2.05a# i could type but i could not start up os x again. i restarted zaped pram. started up in nortons (os 9) but osx would not boot. only to do the same as above. has anyone else had this problem and has anyone fixed it?