Late 2008 Unibody 15 inch MacBook Pro, 2.53 GHz, 8 GB RAM Yesterday it happened once and then stopped, and now it happened again for a much longer period of time: Colored horizontal lines appear on the screen, like the attached image. I took a screenshot with Cmd + Shift + 3, but the lines don't show up on it, so I'm guessing it's not a GPU related issue, but rather a screen issue, though I have had many GPU issues in the past (related to crashing and kernel panics mostly, but only when using the discreet GPU, never when using the integrated one). For this reason I'm only ever using the integrated card and everything has been fine for years. When I move the screen, it sometimes solves the issue, so it seems that it's a connector problem in the screen. Does anyone know anything more about this, such as what else it could be? If it's just a broken cable, is it really expensive to get fixed? I have no warranty or AppleCare. Thanks!