Question What is wrong with my monitor?

There is a chance that one of the cables inside the monitor is damaged.
I think so because the lines are not static. Rather they fluctuate. I remember that when I used to tilt the monitor, the monitor would switch off weirdly even after the cord being plugging properly in.

Is there anyway I can check and fix this?
 
Not without opening up the monitor which is not very safe due to voltages.
I would see if a electronic repair shop is close by. They can probably check it rather cheap.

Even if you know waht you are looking for you might not find it without the right equipment.