i would love to try and help you, but i dont understand what you're asking.
i'm assuming your screen is just randomly going blank? if that's the case, the backlight might be starting to go... is it a laptop, or a desktop?
It might be a 3rd party application that you have installed and is consuming your machine's resources (RAM). Try to check if any app running in backround which is taking too much of your RAM, stop that application and check if it happens.