My power went out the other day and my computer popped off immediately. But it was what seemed to be a spike because it came right back on. Well my monitor wouldn't come back on so I thought it went out. Well I got it to come back on but now when it does before the os comes on there's a black and white line on the screen like a white line right down the middle vertically. with a black border. the monitor seems to work fine. But what could be causing this and is it normal?