How to fix a monitor that won't turn on

Apr 6, 2018
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Hi guys,
My monitor has this problem 4 months ago but I have managed to fix it, however this problem came back again and I really forgot how I fixed it. Like the system unit and everything is working (except the monitor). But thanks to hdmi I can see the graphics through television and for me there's nothing wrong with the pc just the monitor. I really find it difficult using the computer through tv and it's making me stiff.

I have tried removing the ram and checking the plugs and connections but it still won't work.