Try to restart the system is " safe mode with networking " .If the system boots then you can either run updates or do a system restore .

If the system still doesn't check if you can boot the system from from the USB / DVD and repair the system.

Note: Data loss is a possibility .

Now its show  black screen and diagnostics has this message 

It would help if you post the error message as text -- your image is too small to be readable even if magnified.

It looks likely your hard drive is toast.  If the error is 2000-0151 or 2000-0142, that's the case.