You missed the note in red;
Note: If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem.
Tell us that, and tell us more about what happened and when? Has this computer ever worked? If so, when was the last time, and what happened then?
When i switchon my computer, it is not boot and after restart many time approx (30 minutes) there is a screen display showing
start in safe mode,
starts with last best confrigation
and after starts in safe mode and then restore system has boot.
and it repeat every time when when computer is switchon.
so please guide me in this matter.