Graphic Corruption When Nothing Moving On Screen?

When I am doing something that is moving on the screen, including moving the mouse,having a loading bar move or a blinking cursor, my screen is fine. However, once nothing on the screen is moving for about 2-3 seconds, the screen becomes corrupted and a graphical mush. Once I move something again, like my mouse, the screen goes black for a second then returns to normal, as if nothing has happened. The display will not update itself out of this issue if a key is pressed on the keyboard, unless that prompts another screen, like ctrl+alt+delete.