Strange issue I'm having with my 2007 Macbook. Running Snow Leopard 10.6.3. The screen begins to glitch out whenever the OS displays the shadows around window boxes and I get these bizarre artifacts. I made a Picasa Gallery to show all the screenshots I took demonstrating the problem. What do you think? Please help this is a very strange thing that appears to happen almost randomly. Rebooting fixes it temporarily. http://picasaweb.google.com/nickux/MacScreenArtifacts?feat=directlink Colleen Kelly (of TWiT fame) contacted me through Twitter and said it could possibly be an issue of the GPU overheating and/or going back. If this is true does anyone know how much this kind of thing could cost to fix? Or is my Macbook totally screwed? A real shame too it's only been 3 years.