I have been struggling with an intermittent problem for many months, and it is getting worse. I am running windows vista on a toshiba satellite laptop. My screen will go dark (not quite as black as when the computer is off) when I am using it, and although the computer is still working, I cannot see the screen. Then, on startup, I can occasionally see flashes of the startup logo, which is enough to let me know it is loading. My cursor quits working as well. After I run spybot in safe mode, and run it again at startup, it works for some time. (This last time was 2 days). So I believe I have a nasty virus. I run Norton 360 all the time, spybot rather frequently, and malaware bytes about once a month. I am able to get it in safe mode by hitting the down arrow once, and hitting enter. It is very frustrating. I don't think it is the video card, as it is repaired after spybot use. Any suggestions?