When I turn on my computer my desktop goes into a horizontal hold problem and the monitor cuts off. I can't click on anything or do anything but turn the computer off and try again. Usually the same things happens again. I didn't use the computer for two days and was able to get on so I ran a virus scan. Nothing was detected but I swear it must be a virus. Is it the pc tower, the monitor, or a virus that's causing the problem and how can I fix it since I can't click on anything?