Hey, long story short: I replaced the broken screen on my MacBook and the backlight isn't on. The screen is working but hardly visable. I tried AGAIN with a new screen and the backlight still doesn't work. Long story: Basically I love my white MacBook (Early 08). So it shocked me when I dropped it maybe 4" and the screen cracked. Warranty didn't cover it, and Apple wanted to charge 600 or so for a replacement. Being pretty technical, I bought a new screen off the internet and followed instructions to replace it. I spent a good 4 hours during the procedure, and when I finished, everything turned on, except the new screen's backlight didn't seem to work. Irritated, I emailed the company I bought the screen from (www.lcdscreen.com) and they quickly sent me a new one overnight. I uninstalled the first screen, then reinstalled the new one, another 4 hours. (over this period I have damaged parts of my MacBook, the repair is really difficult). Turned it on, still nothing. So I am worried I damaged the component powering the backlight? Is that possible? What does that? Is it the inverter board in the swivel? Any advice would be awesome!