Okay about the keyboard, I'm on a different laptop from the one I use the capture device on, so that's not the issue.
I took a screen shot, however photobucket lowers the quality so you may only barley be able to see the lines, and may need to tilt your screen; however, I assure you they are more noticable on the actual tv screen. So it's affecting both the TV and the device on the computer.
I should say that I tried it with my Xbox using all HDMI, and no issue of the kind. Everything was clear and peachy. It's only been with the PS3 and using the component cables. If I take the component cable, and run it directly from the PS3 to the TV (not using the Roxio device), everything appears fine.
The lines do not appear to be random, they appear to be all be the same distance apart. It's harder to see them towards the top, and more visible at the bottom. If there is any other info I can give you please let me know.