|Even if you lost all files including Vista you would still expect to see something sometime on the screen, such as writing or a Compaq logo, or even a "no signal" screen. That is why I believe you have a hardware fault.|
Many possibilities, including the screen or the cable that connects it with the motherboard. I doubt if it will prove anything but when the laptop is on, gently close the lid and watch the screen until it is nearly closed. If anything shows on it then it is probably the cable worn where it hinges. If it doesn't even sound as if it is booting it is probably something else inside.
Always pop back and let us know the outcome - thanks