Lines on screen?

in Current Mac Hardware edited January 2014
Hi. I'm getting lines showing up on my 30" Apple monitor, with no apparent reason or place.

These lines can be any place within the screen, but generally in the center section of the screen.

These lines show up in most any applications, Photoshop, mail, internet, but so far, not in Freehand or Illustrator, office, text editor that I've noticed.

On most occasions, when these lines show up, I can move the window that they are showing up in i.e., if the line(s) are showing up in this window, I can move it around, and the lines will stay where they are, but they move with the window I'm moving. These line will disappear if I re-size the window.

So, is my video card going, my monitor or something else?

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