My power went out during a storm one day and when I got back up and attempted to turn on my PC, it was on for about 8 seconds, then the backlight in the monitor went black, but the power on it stayed lit as if it were on and being used. I've tried three different video cards, two power supplies, two monitors, and two video cables, and it's all done the same thing. I've also tried adjusting the settings on the monitor, such as the brightness and contrast, as well as resetting to factory settings on it. What do you all think is the problem here and how would I go about fixing it?