Horizontal gray line across imac screen

Hello, wonder if anyone could help with this one...(sigh)...
This evening, quite suddenly, a gray (or black, depending on what's on the screen) vertical line has appeared across my imac screen, about a quarter of the way up from the bottom. Above that are some are three, much lighter lines (more like subtle variations or blocks of colour running across the screen). These appear on all windows I open. I took a screen shot using grab and the very definite gray line doesn't appear. Can anyone give me suggestions of what's wrong and what I can do - I'm out of applecare warrenty now I'm afriad. Is it repairable? or am I looking a buying a new machine, because these lines will drive me crazy.
Thanks!

These appear on all windows I open. I took a screen shot using grab and the very definite gray line doesn't appear.
Excellent work, the Screen Grab grabs it from the Video card, so the prlem is after/outside of that.
Could be the Internal Video cable, or the LCD itself.

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Horizontal gray line across imac screen

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