This is a problem my friend is having and I am going to try to help him. I can always reformat, but he doesnt want to since he has some information on there he wants keep. The computer boots up and all and gets to the screen to choose bootup, like Safe Mode, Normal Mode, etc... once you choose one of them, the computer freezes and he has to restart, bringing him back to the same screen. Anyone know what could be causing this and how to fix this?