SQL Server Service does not start
you need to find the corresponding error in event viewer in windows log\application find the error, one that the source is MSSQLServer and has happened, at the time you started the service.
detail of this error will help you resolve the issue.
(in the image below there is no error in it, it's just an information message, but in your case you may notice an error)


you may also want to check in system logs in event viewer, in the service Control manager to find a related error.