First, you need to make sure that your PC is switched on,

o When you press the power button

of your PC, wait till you hear the beep from the motherboard. If you can hear it, then in all probability, your PC is fine and there's something wrong with your monitor,

o Now, check the LED light on the monitor that indicates that it is receiving power,
If there isn't any light glowing, your monitor isn't receiving power, Check the power outlets and the power cord to see if everything is firmly connected.

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