What should I do if videos are not displayed on the computer screen?

• Your VAIO computer may not have sufficient video memory to display high resolution videos. In such a case, lower the resolution of the LCD screen. [Details]

• If you have selected to use an external display using the (Windows)+P keys and the external display is disconnected from your VAIO computer, the computer screen may be unable to display the video.
  In such a case, stop video playback, press the P key several times while holding down the (Windows) key to select the computer screen as the display output, and then press the Enter key. Then, restart video playback.