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  • When you attempt to power off the computer using the OS, are the HDDs active, any blinking lights, does a mouse/keyboard movement start the computer? If not then it's most likely not a software related issue (at least on the Windows side)
    – cutrightjm
    Commented Jun 10, 2013 at 2:02
  • 1
    You might want to try some other OS, for example a Linux live-cd, to make sure it's not related to Windows.
    – KamikazeCZ
    Commented Jun 10, 2013 at 2:14
  • What is the OS? It sounds like the default action for the shutdown button in the Start Menu is Standby or Hibernate.
    – Davidw
    Commented Jun 10, 2013 at 2:32
  • It's Windows Server 2008 R2 x64. The default action is Logoff, but I make sure I click Shut down when I want to shut down. I'm preparing a Linux live-USB to try it out.
    – 0xFE
    Commented Jun 10, 2013 at 2:38
  • Ok, it's definitely not that, then, as Windows Server does not have any Sleep modes. Have you tried using the Command Line Shutdown command, or Powershell's Stop-Computer commandlet?
    – Davidw
    Commented Jun 10, 2013 at 2:40