Powerbook detect displays doesn't work on LCD TV. Does on other TV.

Hello,
I recently purchased a telemprompter which uses an LCD TV with a composite input. (From here on out referred to as teleprompter) I set my powerbook up with the S-video to Composite adapter and hooked it up to my Big TV. The screen automatcially detected the external display and changed the settings and diplayed the screen.
When my teleprompter showed up, and was plugged in, nothing happened. I went to the display perferences and clicked detect displays and the image flickered once on the telemprompter. But it didn't show anything else and a second display box did not show up.
Then I plugged my TV in and it didn't auto detect, but when I clicked detect displays it did and all worked again. Then I plugged the telemprompter into the cable and IT WORKED. I could use the LCD TV.
I then clicked "detect displays" and the image disappeared from the teleprompter and the second display box disappeared.
For some reason it is not seeing this particular device. Is there a way to manually force a 2nd display? Everything would work, if I could tell OS X to output a display out the S-video port.
Is this possible? Manually set 2nd display?
I'm using 10.4.4 on a powerbook 1.67ghz. I'm going to try a cheap VGA scan converter in hopes that it will work that way, with a DVI to VGA to scan converter, to composite.

I don't know if my recent experience helps us understand your dilemna, but I just bought one of these NEC 20" all-in-one LCD monitors. It has DVI, VGA, YUV, S-Video, Composite video, and RF input. It's native resolution is 1600 x 1050 and can supposedly scale any input resolution up to 1920 x 1080i. I'm having issues very similar to yours... maybe we can solve them putting our 2 brains together.
I have (2) mini-macs. One of which detected the monitor just fine, and displays the 1600 x 1050 perfectly over DVI. The other seemed to only get a 'partial list' from the monitor when it did it's display detection. It seemed to only get the 'TV' style resolutions, because most of them are interlaced options, and the olny one that doesn't make the monitor twitch like an epoleptic is 1280 x 720p. There is no 1600 x 1050... there isn't even 1024 x 768, 800 x 600, or 640 x 480 listed!!! The funny thing is, if I output to the montior analog VGA (as opposed to DVI) I get the 'full list' of resolutions. This tells me that a 1-time preference/ registry is being made/ created when the detect displays is hit for the first time with a monitor. I can't figure out where the **** this preference information is stored either. It seems if we can find out where on these mini-macs this registry is made, we can solve both are issues... because it certainly is not an issue of the graphics not being able to output the desired resolution. It seems to be some bug in reading the DDC info from the monitor.
If anyone can help.... much appreciation would be had from this frustrated user.

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