Samsung s27d390h flickering / flashing

Hi, I need help identifying faulty component in my samsung s27d390h monitor. When I plug in the monitor it flickers light keep turning on and off. Sometimes it turns on but when unplugged its the same problem. I think it's something wrong with the power. When it flickers you can hear clicking (relay maby). Please help if anyone knows what's wrong.

Here is the video of the screen flashing if this helps:

https://youtu.be/xDAABa2O6nU