iBook thinks LCD is a Television

Thanks for helping out. When I booted from the other iBook's hard drive, I logged in as a user on that computer. (It again detected the display as "Television" suggesting to me that it was a hardware problem.) Earlier, I also tried booting with OS 9. It didn't work, but can't remember the details. Is there another reason to make a new account?
Mike

Deleting the systempreferences.plist file didn't fix the problem. It still detects the LCD display as a "Television."

I haven't tried a regular moniter, but the projector and adaptor worked perfectly with the other iBook (same model). I can try a monitor tomorrow to make sure.

I hooked up a 17" LCD display, and it behaved exactly the same as the projector: when booted, the gray screen with the Apple logo showed on both displays, then the external display went black as the iBook display switched to the subsequent blue-background screen. The external display was no longer detectable.

Is there a way to bypass the attached LCD for the external? I was not able to wake the closed iBook from sleep using an external keyboard like I could with my old TiBook. I read somewhere that this is disabled on iBooks because they cool through their keyboards.

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.)

Actually, the LCD was showing up as a Television even if nothing was connected. Today is the first test to see if the fix suggested in the previous response sticks.

It acually turned out that there is something wrong with the A/V port. Everything works when headphones are plugged into the A/V port, but the computer thinks a television is connected otherwise. Until your post, I never realized that the headphone port also serves as a video-out port. Thanks! I don't see anything lodged in the hole that could be causing the problem, so we'll just keep headphones handy.