I have a dell e173fp that started acting up yesterday. It was perefectly fine and then all of a sudden the screen went totally black. About every 3 seconds, the screen would flash for a moment and then go black again. The monitor couldn't be turned off, it just continued flashing. I unplugged it for a few minutes, and after turning it on, it worked fine. This morning when I tried turning it on, it started flashing again, but this time unplugging it didn't solve the problem. Anyone have any ideas as to what's going on?