My TV (that I use as a monitor) has problems with video games now. When I move up and down there are transparent black lines that go across the screen and when I move left to right there are vertical ones. I changed the HDMI port and cable and the problem is now gone. The weird thing is this only happened in two of my games, so I'm confused as to whether this is my computer's fault or my TV's fault. It is about 4 years old so maybe it's time to get a new one.