desktop screen flashes black then turns off

i turn on my desktop computer and i log on and open up my usual programmes then after a while the screen flashes black and back to normal screen , couple flashes later it goes black and the green power button flashes i have to turn it off and on again for it to restart but the problem is still the same ,
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  1. Which power button flashes, one on your computer or the one on your monitor?
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Desktops Computers Windows XP