Consider the following scenario:

  • You connect an external monitor to a portable computer that is running Windows Vista.
  • You disable the portable computer’s built-in display.
  • The portable computer turns off the external monitor because of the lack of user activity.
  • You disconnect the external monitor, and then you resume the portable computer.
  • The portable computer’s built-in display turns on.
  • You reconnect the external monitor.

In this scenario, the external monitor displays a black screen.

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