When a computer running all of a sudden power off after each set to start self-D (non-disc system)

Every few minutes to be self-boot disk D, D and set a non-system disk.
What is the problem? And how to solve? The best there is a complete solution.

found in the Start menu, enter cmd run dos enter into:chkdsk * d:/ f * attention on behalf of a space with an asterisk is to remind you that between the d and k There is a space issue, I have tried all the methods are not tried in the line, the final trick – into Safe Mode, the D format, on the resumption of the fine! ! When activated by using a carriage return
will not matter because the non-normal shutdown could lead to the loss of some disk file system, general machinery needed to start again, it is important to re-detect hardware disk, so after the power The re-start the process of user needs a certain degree of patience to allow the system to do a full inspection.Convenient to use next time.At the same time, each of the best switch from the “Start Menu” shut down and not directly to the machine shut down power to avoid non – The necessary trouble.