Line on screen , square flickers and screen lock up.

On this macbook pro a1226 i'm trying to diagnose, there is a red line sometimes black down about the middle of the screen . I can normally log into the desktop but when i start using programs or pushing the mac it also get's like square or rectangle flickers about a couple inches long usually it will lock up on me with the computer still running. If I try to run the installation dvd it will kernal before it gets to the desktop. Runs ok on external monitor and pushed the gpu best i could so it's not a Nvidia graphics problem. I'm trying to find out if it's the screen itself or the video cable. I"m thinking it's the screen I inspected the cable and looks untouched anyone had a similar problem? This model is LED also.

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