S-Video and Composite Adapter Output Flickers, is B&W, etc.

Okay, here are the details:
- Bought a new *Mac Pro (2009)* Quad 2.66
- Customized with an *ATI Radeon HD 4870* card
- Current OS version: 10.5.7
- Attempting to use *Apple's DVI-Video adapter* (works fine with my G5)
- Poor, flickering, black & white, duplicate, partial signal appears on TV using either composite (RCA - yellow) or S-Video
- There is *no literature anywhere* that states whether this adapter is supported (or not)
- ATI cards have traditionally (before the 4870, not sure about the previous Mac Pro model's ATI cards) been able to correctly output analog video signals using this adapter
- Apple's phone support personnel say *it should work*
- Tried a *newer adapter at a service provider with no difference* in the results
Any help, advice, etc. is appreciated.
PS - If I can't find a solution that doesn't involve buying anything extra, I'm considering getting the DVI-VGA adapter with a VGA converter box (VGA in, S-Video and Composite out) which seems to be the only viable alternative (as getting a new card won't help when/if I get a Mac Mini for movie watching).

Hi Com,
I don't have an answer for you but maybe in the comments about it someone has said something helpful: http://store.apple.com/us/product/M9267G/A
I think that Apple would like to say all it's adapters work fine but I don't think that's really the case. The VGA to Mini Display adapter I just bought was only able to coax a very limited amount of resolutions from my CRT. Other people are finding other adapters not being up to snuff and buying this one as a cure. http://store.apple.com/us/product/MB571Z/A?fnode=MTY1NDA3Ng&mco=MjE0ODQ2Nw
But even this has it's problems.
I hope someone else writes in to help. I hope there's a work around for you. It's just hard to know what is Apples responsibility to do and yours. Yours I don't believe should be an issue if the adapter worked right.

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