dell laptop screen changing colors

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Has anyone had an issue with a dell laptop d505 having an issue with
the screen. What happens is you get rectangles with what looks like
test pattens in it all over the screen and then screens color changes
or just shuts down all together.

We have replaced the screen, motherboard and also the video card and
also took out the memory sticks to see if that was the issue.

I'm at a lose and any help would be great.

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