If you select a video mode that is out of range, then you see that. Fix? I boot to safe mode and set it to 800x600 and 60 Hz. Save that and reboot.
A friend has a Dell desktop system running Windows XP. The system is several years old. They have been having resizing issues for a while where the screen just switches to a huge font and no way to go back without a reboot. Recently, when booting, they started getting the message "Input signal out of range". Does anyone have an idea as to what is going on and what it will take to repair?