Last night I was using Handbrake to convert a movie on my 2009 13" MBP. Bear in mind I've done this about a thousand times. Well about 15 minutes into converting this movies, my screen suddenly started fading lighter. Over the course of about 10 seconds it went from normal to pretty much white with 7 or 8 vertical lines on the screen. Of course I hit the power button until it shutdown, and when I turned it back on it was fine again. What caused this and is it an issue? I assume the nVidia chipset started to overheat, but iirc Handbrake taxes the CPU, not the video.