Thanks! It helped flickering problem solved, but I noticed some vertical frequency issue also and it turned out that if I have other power supply cable (laptop or router) close to the monitor power supply cable, the picture get unstable, very weird. When I unplugged everything but the monitor power cord the picture is perfect. It seems the stock power cord is a crap. Now I have to plug in all the stuff far away or I need to find a better power cable to see if it was the problem really. I wounder why I never heard this problem on this forum. Is it only me?
Any thoughts?
Any thoughts?