Suddenly restart the computer after the normal black and white answers, please

This afternoon, quite a long time to open the computer, playing games and watching television, black and white all of a sudden, there is no response after the restart
have returned to normal
what is the reason??? What needs to be done ..
Open for too long because the reasons for it? Or voltage problems?

Black and white?? LCD is liquid crystal or CRT Oh ..If the LCD screen is a problem, if the warranty on the case as soon as possible to point to after-sale, if Paul had words on the Buhao Ban, CRT's words may be all right ..of the Xu Han!
you watch TV on a computer ah!