nvidia 8800gt clone mode issue

  User-44ABB03F-5A01-4521-8D3E7A783936DB72 14:00 22 Jan 2008

I am trying to clone my old 37" toshiba tv via s-video to my monitor but cant seem to get clone mode to work. either the tv picture shows a b&w image of desktop background or the monitor goes black. the settings are not very clear. any suggestions?

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