Ok I'm having some serious issues with the screen on my laptop. It started with a few pixels being the wrong colors, and then I started having a trail of pixels left every where I moved the mouse. The pixels would move if I put the mouse back over them. Then I started having vertical lines of off colored pixels. Then I gotta a message about an error I think it said NV4 and drivers in the error, and that my display was switching to the lowest level due to the error. Now my screen is always on the lowest resolution, the colors are off and I still have the vertical lines. Is my video card dead? If so how much are those to replace?