I've been having some issues with certain video games on my Dell laptop. It isn't all of my video games, and no other function of my graphics card seems to be affected. Basically what happens is, stripes of color will run across the screen and I won't be able to see anything.
Well the pictures aren't showing up for me. The monitor could be going bad, or it could be overheating. Have you checked your temps? Honestly since its a laptop the best thing to do is have it repaired by Dell, hope its still on warranty.