Hi, I recently replaced a cracked LCD on a Macbook (purchased new May 2007). It worked fine for about half an hour, and then it became extremely dark. I can't see anything at all except the shutdown menu thing that pops up when you press the power button, and that just barely. Does anyone know what could cause this? I hesitate to replace the screen again when it could be something else. Edit: I just noticed that you can actually see the images on the screen when it's near a bright light source such as a lamp. It just isn't casting its own light.