Turn it on.
The computer screen could have becomed damaged and so might the computer.
If your computer screen goes black, the first thing to try is to turn your computer off, and then turn it on again. This allows the computer to re-boot.
your computer must be broken.or hacked
your computer has crashed
Catch it before it smashes into your ceiling.
If it is just the monitor that is shutting off, then there might be a problem with the monitor with staying on. If by 'screen', you mean the actual computer goes off and produces a black screen, then your computer might be set to go into hibernation quickly, or it might have a mode where it goes into a blank screen saver quickly. Check the computer's settings to fix that problem.
it goes blank because it is not been used
press ctrl, alt and up. hope this helps :)
The monitor cord, that goes into the computer, is probably not all the way in or damaged.
Did you change the graphics settings before that happened? What I did is I found out a way to start windows in safe mode, and I restored the system. But I couldn't get the screen size to normal :( . Call a computer specialist or something, he/she could help.
it doesn't turn off but goes into sleep mode (when screen goes dark). it can be turned "back on" by holding down the center button.
the graphics card is an attachment inside your computer,phone or games console which displays what goes on in your screen e.g a plane flying, what your reading now or pictures anything on your computer screen comes from the graphics card.