 
<ol>
  <li>Verify that there is power to external enclosures and connections. </li>
  <li>Verify that cables are properly seated.</li>
  <li>Check for damaged, bent, or pushed pins on the following: 
    <ul>
      <li>Termination (for non-backplane systems)</li>
      <li>Backplanes</li>
      <li>Physical drives</li>
      <li>Controller</li>
    </ul>
  </li>
</ol>
<p>If you cannot identify a connection problem, the replacement order for parts 
  is the following: 
<ol>
  <li>Termination (for non-backplane systems)</li>
  <li> Cables</li>
  <li>Physical drives</li>
  <li>Backplanes</li>
  <li>Controller</li>
</ol>
<p>Before replacing a physical drive or controller, verify that it is updated 
  with the latest firmware (microcode) and that they still fail. <br>
  <br>
  <b><img src="../images/note.GIF" width="16" height="16">Note:</b> If multiple 
  physical drives are marked defunct within the same time period, check the cables 
  and backplanes. 
