title: No bootable medium found on VirtualBox
body: <p>I'm trying to run Windows Server 2012 on VirtualBox.</p>
  
  <ol>
  <li>I created a new virtual machine with these default settings:</li>
  </ol>
  
  <p><img src="https://i.stack.imgur.com/rx3XW.png" alt="enter image description here"></p>
  
  <ol start="2">
  <li>Then I added my ISO and changed the boot order:</li>
  </ol>
  
  <p><img src="https://i.stack.imgur.com/voA7e.png" alt="enter image description here"></p>
  
  <p>But after starting the machine I get the following error:</p>
  
  <pre><code>FATAL: No bootable medium found! System halted.
  </code></pre>
  
  <hr>
  
  <p><strong>Update</strong>:</p>
  
  <p>I checked both the md5 and sha1 hashes, they were both ok.  </p>
  
  <p>This confirms the download size:</p>
  
  <p><img src="https://i.stack.imgur.com/wt1mm.png" alt="enter image description here"></p>