Since yesterday I have noticed that the desktop that appears after a while that you have not used your computer has turned from the normal black to red.I have always left it the same way it came when I bought it with The little multicolor Microsoft flag floating around yet now the background is red. It also happened when I turn off or on my computer. Today when I shut it off a very bright red line sparkled at the bottom. I've tried everything. Has this weird thing ever happened to anyone. Can someone help me return it back to it's normal state?