Consider the following scenario:

• You have a video camera that is connected to a Windows Vista-based computer through a USB connection.
  Note: This kind of camera may also be known as a “webcam.”
• You use the video camera together with a video-capture program to capture input from the camera.
• The computer is configured to use a power plan that puts the computer to sleep after a specified period of inactivity.
• You use the camera-preview feature to view input from the camera, and then Windows Vista enters a sleep state.

In this scenario, you may experience one of the following symptoms when you resume the computer from sleep:

• The camera-preview feature displays a blue screen that contains no video from the camera.
• The camera-preview feature displays a black screen.