Last week I bought a replacement LCD screen for my MacBook Pro 15" from a very respected ebayer. Just got here, installed it, and ran into a weird issue. When the screen is off, you can see some black marks all around, mainly a big spot on the upper left corner and then some vertical black lines all along. I initially thought these marks were just because the screen wasn't clean enough. But, when the computer is on, those marks turn into something really nasty: the upper left spot becomes a black blob, while in the exact same position were the vertical lines are, blue strikes appear. I had never seen a visible LCD flaw when it was off. Things I know: An external monitor works just fine. The iSight and Aiport work flawlessly Has anyone else seen an LCD gone bad like this, with visible black marks when off that show where the flaw is? What is the likely cause? I know the LCD was used. Did it got somehow broken on the way or was it dead all along?