title: Cannot start SQL Server service
body: <p>I am having problems starting the SQL Server (<code>SQLEXPRESS</code>) service. </p>
  
  <p>When I press "Start" it says </p>
  
  <blockquote>
    <p>Windows could not start the SQL Server (SQLEXPRESS)... </p>
  </blockquote>
  
  <p>and refers to service-specific error code 17113</p>
  
  <p>Event viewer: </p>
  
  <blockquote>
    <p>Error 2 (The system cannot find the file specified.) occurred while opening file 'D:\Programi\SQL\MSSQL14.SQLEXPRESS\MSSQL\DATA\master.mdf' to obtain configuration information at startup. An invalid startup option might have caused the error. Verify your startup options, and correct or remove them if necessary.</p>
  </blockquote>
  
  <p>So as I believe I am missing <code>master.mdf</code>. But where do I get one? I might have deleted it somehow.</p>
  
  <p>Thank you for helping!</p>