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

• The video memory of your VAIO computer may be insufficient for displaying high resolution videos. In such a case, lower the resolution of the LCD screen. [Details]

• If the external display is selected as the display output with the Fn+F7 keys and is disconnected from your VAIO computer, the computer screen may become unable to display a video.
  In such a case, stop video playback, press the Fn+F7 keys to select the computer screen as the display output, and then press the Enter key. Then, restart video playback.