I'm new to my old MAC mini device. When I power on the box, the apple icon shows with a white line across the screen and it continues slowly, till almost to the right hand side end of the line - but then the screen goes black and nothing will make it finish. Nothing else will wake up the screen - nothing happens, Have tried some internet suggestions like reboot to safe and other multiple keys strokes. Cannot get to safe boot. Nothing seems to work. Is there a solution I should try.