I wondered if anyone might be able to help suggest what is causing this problem with my laptop's screen (logic board? LCD itself, etc?). It's been stored for a while since I upgraded last year, but I was going to pass this older one on to family and found this when I booted it up (the blue part of the screen). As you can see I booted into the Snow Leopard installer and have also tried a screenshot in the OS on the internal drive to make sure it's not a software problem (the screenshot didn't have the blue tinge). I have tried taking it apart and couldn't see any obvious problems with the display connecter, etc. The model is a 2006 Core 2 Duo 15" MBP with ATI graphics, not the nVidia model that replaced it (which is known for problems).