Dell Latitude 1501 Dim screen problem

UPDATE - It was the cable to the screen that was bad. It cost $10 on EBay.

I need your help! I have this Dell 1501 laptop that has no light for the screen. Here is a picture with the bulb working fine with an external high voltage power supply. So then I bought a new inverter on EBay, straight from China, installed it and it still does not light up the screen. That narrows the problem down to something in the BIOS (I reset it to factory defaults) or perhaps the wiring harness? Maybe it is a fuse on the motherboard? Does anyone know the solution? I googled it and read about 100 posts of people complaining about the same problem but no one knows the solution, do you?