Screen problem

Hye guys. A week ago my screen start flickering when it i on the switch.
It flickering on screen startup. when it show signal.
But after that its just fine.
But now. I even cannot open my lcd monitor.
I have BenQ FP92W.
When i want on my screen show signal.
But after i press on my CPU.
My monitor automatically off.
Black and no power light on.
But it depends on luck. Sometimes i can on my screen and play well. only flickering. sometimes it flickering turn black and no power light.
If i am luck. It will be like this. >
Please help…

Have you tried different resolution/refresh rate?..

I dont want change hertz.
Now i use 60hertz.
If i raise the hertz.
My eye sick…
I already have maximum resolution…