It would help us to help you if we knew more about your hardware.
1) Are you talking about a laptop or a desktop computer and monitor?
2) What are the brands and full model numbers of the hardware?
3) Were there any hardware or software changes just prior to the problem starting?
4) Does the problem start as soon as the computer powers up or after the desktop appears?
5) In a darkened room can you tell if the screen's backlight is turning off when the screen goes black?
6) What operating system is running on the computer?
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