I looked at my computer light and noticed it had started its on update so I let it run. When it finished he computer restart itself and froze at the log in screen. So I waited a minute or two before turning off the computer. Now everyone I start it back up it doesn't even make to the log in screen. It does the whole start up process but then goes to a black screen with a cursor when it's suppose to load the log in screen. It won't even load the option for safe mode when I hit f8 when computer is started.