If I am not mistaken, you either press the f5 button before the computer posts or the f8 button before it posts. My old Toshiba showed what button to press. You then use the arrow keys to maneuver to OPEN SAFE MODE. I am not sure if my old computer is the same or close to yours, but just try it yourself on your computer. No permanent damage will be done. If you are stuck, just go back to REBOOT COMPUTER