No picture w/ mini dvi adapter

ok. So, I have an Apple mini dvi to video adapter. I use it all the time on my tv's using both composite and s-video (s video on my HD flat screen, and composite on m cheaper tv.) Everything works great. no problems. Until I go to my girlfriend's house. I use the composite side to connect to her tv. I believe it is a Sylvannia or something like that. I get no video, just scrambled style lines.
Now I've seen this before, with my iPod video cable where i had to change the PAL/NATC settings. Something to do with American versus overseas products. No worries. But i can't seem to find those same settings on my MacBook.
Where do I change the settings so i can watch movies on her tv? like i said, I didn't change anything when i connected it to my tvs, i get great picture.
Please help !!!! I can't watch another movie with her on my little MacBook screen......

ME TOO !!!
I have connected the mini DVI to video adapter with the composite to my TV (about a 5 year old model). Also connected Audio cords to TV, and the audio is wonderful...BUT NO VIDEO! Actually I get about 5 seconds of a DVD or whatever, and then the screen turns blank...just nice audio thru TV. HELP!!!!!!!!!!!!
Thank you!!

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