An external monitor does not turn on after you reconnect it to a Windows Vista-based portable computer after the monitor is disabled and re-enabled

Article ID: 959657 – Last Review: November 25, 2008 – Revision: 1.0

An external monitor does not turn on after you reconnect it to a Windows Vista-based portable computer after the monitor is disabled and re-enabled

SYMPTOMS

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.

CAUSE

This issue occurs when all the following conditions are true:

  • The portable computer turns off the external monitor because of the lack of user activity.
  • The portable computer is running Windows Vista or Windows Vista Service Pack 1 (SP1).
  • You disconnect the monitor from the portable computer without resuming the monitor.

When these conditions are met, the portable computer switches to the internal display monitor and does not recognize the external monitor, even after you reconnect the monitor to the portable computer.

RESOLUTION

This is a known issue with Windows Vista. You may have to reset the display device configuration after you reconnect the external monitor to re-enable the external monitor.


APPLIES TO
  • Windows Vista Home Basic
  • Windows Vista Home Premium
  • Windows Vista Enterprise
  • Windows Vista Business
  • Windows Vista Ultimate
Keywords: 
kbsurveynew kbdisplay kbexpertisebeginner kbtshoot kbprb KB959657

 

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