DVI to Video - TV not recognized!

hi excuse me for adding this post since the subject above came up in another post of mine with a different subject line...
so i have hooked up a cinema display and added apples DVI-Video adapter to the second output of my NV7800GT card. then, when i go to "detect displays" in the display prefs nothing happens. i switched the cale positions as someone suggested but this had no effect. i have the TV on, and have tried both the S-VHS and the RCA composite outputs off of the adapter.
what am i doing wrong?
thx for helping

I've got a 2x2.66 GHz Dual-Core Xeon
running OSX 10.7.3
NVIDIA GeForce 7300 GT 256 MB
and of course the APPLE M9267G/A DVI To Video Adapter
The apple video adapter attaches to video card via DVI-I
When booted with the APPLE M9267G/A DVI To Video Adapter alone, there is video signal present, but it is very unstable and will not lock at any available software resolution / frequency combination.
However, when I click the Detect Displays button the video signal stops.
The APPLE M9267G/A DVI To Video Adapter works a-ok with my
1.8. GHZ PowerPC G5
OSX 10.5.8
ATI Radeon 9600 XT:

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