Every time I shut down my system the screen is not just blank. It says safe to shut down, but the top two inches of the monitor on the screen is showing what looks like a board from inside the computer. I don't know how else to explain it. What caused that and how do I get rid of it? This happened on the old drive I had in the machine. Since I put the new one on it stopped completely until tonight, but now it is back. My son was on the computer and went to a nintento 64 sight tonight and yahoo. Could something in those sights have caused this?