You'll get a lot more help if you identify the machine make and model. And give some more information on your problem. Smart guys are on here, but not too many mind readers.
Most probably a failed hard drive.
What machine ?
Hi every body,
I so thank for supporting .
I already fixed this issue, and i want to share my experiment for everyone.
please see my detail actachment. If you want dicussion, let me know.
https://drive.google.com/open?id=1RB...rHLl917Bc78asz