Windows' Narrator reads onscreen text, dialogs and error messages to you, making it possible to use your computer without looking at the screen. This accessibility feature primarily aids visually impaired users, but it's also useful if the display is not working. If you accidentally start Narrator, the results can be startling without an obvious way to turn it off. Fortunately, Microsoft included a few quick ways to toggle Narrator on or off.
Pressing "Windows-Enter" on your keyboard quickly toggles Narrator off in Windows 8.1. If you're still using Windows 8, press "CapsLock-Esc" instead and then select "Yes" to exit; this option also works in Windows 8.1. On Windows tablets such as the Surface Pro, you can alternatively press the "Windows" and volume up buttons simultaneously. The Ease of Access section of PC Settings also offers a slider switch for manually disabling Narrator. If you're using Windows 7, you'll need to search for and open "Ease of Access," click "Use the Computer Without a Display" in the Explore All Settings section, deselect "Turn on Narrator" and click "Apply."