When the screen is open 90 degrees, won't power on/shuts off?

On the ibook G3/G4 the inverter cable is coupled with the reed switch cable (2 wires) so 4 wires total if i remember well. The two cables are taped together. Often the problem comes from the reed switch cables that seems to be more fragile and susceptible to break in the hinge causing screen lightning malfunction and sometimes electrical short. I've seen many ibook logic boards damaged by a reed switch cable short but never seen a LVDS cable shorting a board. I may be wrong....

I am sorry lemerise if I came off wrong. I upped your answer and am not questioning your expertise or thoughts about the root of the problem. I just got confused when I read: "The only cable that brings voltage to the screen is the inverter cable..." I apologize if my comment offended you or caused you to feel that I question your expertise.

Don't worry about it ABCellars. We are here to help and you're doing a great job in Answers, I would even say "one of the more competent tech on this web site". :-)

Call me lazy, but it might be easier to get a whole replacement screen assembly off of eBay, or from a parts machine. Opening up the hinges on these things is not fun. I always just replace the whole screen assembly, but then again I have the luxury of having lots of scrap machines around.