Linda gets a red/green pattern on her HP computer from time to time. Leo says that's a defective component. Maybe your video card. It could also be a corrupted video display driver. Leo would recommend returning the computer if you can. Call HP. They'll make you reinstall Windows, but it's obviously a defective computer. You'll probably have to fight with them to get them to replace it. But it's definitely a lemon. You may need to get your bank involved.