title: Google Nexus 7 didn't recognize via USB
body: <p>Please help me. I'm trying to connect my Google Nexus 7 to my PC for Android development.</p>
  
  <p>I've tried connecting to my PC with different cables. When I connected the device to my Windows 7 PC, I didn't get any notification on Android or my PC that device was connected. In "Other devices"  my PC shows <code>Unknown device</code>. I try use <strong>MTP</strong> and <strong>PTP</strong>, as well as disabling and enabling USB debugging. I've used <strong>Nexus Root Toolkit</strong>, <strong>Universal Naked Driver</strong>, <strong>Nexus 7 toolkit</strong>, and I've tried this tutorial and many other <strong>http://www.youtube.com/watch?v=IjWjCQXlWDc</strong> and nothing has helped me. </p>
  
  <p>I don't understand why there aren't any notifications on Android. Could it be a hardware problem? How i can check it?  </p>
  
  <p>Please help me, because I haven't found any way to fix it.</p>
  
  <p>Thanks. </p>