IBook thinks LCD is a Television

We have an old iBook that we use for presentations with a projector, and it recently stopped being able to send signal to the projector. If we boot the iBook with the projector attached, the initial grey screen with the Apple logo appears. When it switches to the blue background, the projector says "no signal." In the Displays preferences, the main display is called "Television" and it gives choices of different resolutions and MHz. (It should be "Color LCD" and without the MHz values.) The projector does not show up as a display.
Thinking that it surely was a software problem, I booted the bad iBook off a good iBook G3/500's HD (in target disk mode) and the same symptoms appeared. It is not a connection problem since the adaptor works fine when plugged into the other iBook. Zapping PRAM and resetting the PMU did not remedy the problem.
Does anyone have any ideas? Could a short circuit (perhaps in the wires going through the hinge) be confusing the display detection?
Thanks,
Mike
iBook G3/500   Mac OS X (10.4.8)  

Although I was very skeptical, doing this fixed it...temporarily. After resetting the PRAM, the Displays preference pane came up as Color LCD. I put it to sleep, plugged in the projector, woke it, and that worked too. After telling everyone that it was fixed, I put it to sleep, disconnected the projector, woke it up, and then it had gone back to thinking it was a Television display. It still didn't detect the LCD correctly after restarting it. I was going to reset the PRAM again, but missed the start-up chime. (Another weirdness of this iBook is that the Start-up chime doesn't sound through the external speakers, only throught the head phone jack...at least some times.) After it booted the second time, miraculously, it again detected the LCD.
I know that for the second reboot the screen was opened around 90° but I don't remember how far it was opened the first time. Hopefully, the first reboot was a fluke and there is not a short in the LCD cords going through the hinge. (I suspect that my personal iBook G3/500 has come down with the dreaded cords-through-the-hinge problems where things go haywire if it is opened 90° of more (screen flickers, I lose WiFi connections, and my trackpad occasionally stops responding). The part arrived today.)

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