I have a MacBook, and I installed Leopard a week ago. I was just browsing the internet with Firefox and listening to some music using itunes today...then my MacBook stops responding, and the color wheel comes up. I use Force Quit, it doesn't help. I then turn off the computer, and return it on. Only a blue screen comes up and it stays there. (x countless times?). I reset the PRAM? by turning it on, and holding Apple+Alt+P+R. That doesn't work. (x2) Now its a grey screen. a Folder with a question mark shows up, flashing. I put in the OS X install disk, and it goes to the installer. I go to Disc Utility...my hard drive isnt listed there. Also, my Hard Drive isnt listed under the "Choose Destination" when I am installing Tiger... I am expecting the worst right now. My MacBook is still under 1 year warranty... Any ideas?