Help! DVI output with no video?

I've got a macbook 2.16ghz with 1 gb ram that I just upgraded to Leopard.
I have a Sony HD TV that I use to watch movies from my laptop, using a mini-DVI adapter through DVI to HDMI.
I use the remote menu to navigate, and the video works fine when I don't have the dvi connector in.
But, when I put the remote connector in, and the mac automatically adjusts the resolution for the tv, the video stops working in the remote menu (I still get audio just fine with a black screen). It works fine if I manually open the movies with quicktime or itunes in the normal screen, but the navigation is better with the remote menu, and I'd prefer to use that. I didn't start to have this problem until I upgraded my OS. Help?

I had the same problem with my Sony Bravia TV and seem to have solved the problem
Make sure the DVI cable is connected before the computer is booted up - it appears that mine doesnt detect when the computer is already on and the cable is then connected but does work if it is already connected.

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