I have a little problem. When I play games on PC, there will be invisible horizontal lines on screen. It will happen if there is fast motion. My monitor is Samsung FX2490HD. The response time is 5ms, is that a problem? I heard that monitor should have 2ms response time. My GPU is GTX 660 Ti, and drivers are up to date. I tried to play games with HD 4850, and there was still those lines.