In Windows, you can use themes to help make your desktop feel a little more personal.
High Contrast themes improves readability of the display by applying a special system color scheme.
When you use the [key]left Alt[/key] + [key]left Shift[/key] + [key]Print Screen[/key] keyboard shortcut to turn on or off High Contrast, a sound will play by default to let you know.
When you use the [key]left Alt[/key] + [key]left Shift[/key] + [key]Print Screen[/key] keyboard shortcut to turn on High Contrast, a warning message will display by default asking you to confirm with Yes or No.
This tutorial will show you how to enable or disable the warning message and sound when turning on high contrast in Windows 7, Windows 8, and Windows 10.
Read more: General - How to Enable or Disable High Contrast Warning Message and Sound in Windows