I received a blueberry iBook clamshell from a friend with a dark LCD panel. I can see an image on the panel (which eliminates a bad video card) when the system starts up, but it has no backlight. I purchased a replacement Samsung LCD panel from Powerbook medic, but even with that, the image is dark. Thinking it might be the inverter board, I have gone through 2 of them (both from Powerbookmedic) and the image is still dark. What should I consider replacing next? There is a cable that connects to the inverter board that descends down underneath the keyboard. What does this connect to? I have purchased a take-apart manual to get a sense of what is underneath the keyboard without having to do exploratory surgery, but if anyone can give me some insight, that would be very helpful. Thanks!