Hi Brenda,
Check the "Power" section of the Motion Dashboard. Hit properties and look at the "power schemes" tab. There are two different settings. One for batteries and one for plugged in. Look at the diferent settings and then check the screen saver settings for time. Possibly the screen is shutting off before the screen saver can start. My screen saver never comes on since it is set to start in 30 minuets and the screen goes "dark" after only 15. LOL, not much point of having a screen saver in that case.
Dana