clarkjd :
Are the lines always in the same place on the monitor? When you hook the monitor up to a different computer, are the lines still there? If the answer to both questions is "yes", then the monitor might be the problem, otherwise, I'm thinking that your graphics card is "artifacting", a sign that there are problems with its ram.
This lines go like in wave like formation.
I dont have one cable, I got one cable from my monitor and an adapter in my GPU.
No, no, I tried it at my old PC, no lines.
Maybe it's the cable.
If its the monitor, I can't do shit, since I spent all my money on the PC.