For the last few weeks, I have had an intermittent display problem where every other column of pixels turns white. It happens nearly once/day, and can last for several hours, or just flicker a few times. I typically use the 1440x900 resolution, but when this error occurs, it's visible at all screen resolutions, and is unaffected by changing screen brightness, closing/reopening the lid, and restarting the machine. It has occurred on first opening the lid in the morning when the machine is quite cool. The error does NOT show up on an external monitor, which I assume means the video card is not at fault, and it's not a driver issue. Photo of the error: Machine stats: 15" MacBook Pro 3.1 OS X 10.4.11 2.2 Ghz Core 2 MA895LL GeForce 8600M GT 128 Mb VRAM This computer is not covered under warranty. Any suggestions as to how to fix this would be appreciated. I'm reasonably handy, so if there's something internal that needs tightening/checking, there's a chance that I could do it without losing any screws in the process. Thanks.