Hi there, The LED light indicator for the built in FaceTime camera on my late 2013 Retina Macbook Pro blinks green (about two seconds on and two seconds off) whenever I try to open an application that requires its use. If I open FaceTime it shows a black screen. So does the baby monitor I use for my child. When I select "Preferences" with the FaceTime application open it does nothing, but grays out the "Preferences". I'm hoping it's not a hardware issue. Apple already had to replace the display under warranty. Any help would be greatly appreciated. Running OSX 10.9.5. Thanks, Z.