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Modulator is only necesarry when connecting to the coax input on a TV (make sure channel 3/4 is set correctly). If connecting to RCA or Svideo on the TV it's not necesary (but make sure the TV is set to "Line in" or "video" or whatever your TV calls it).
Do you see the bios bootup screens on the TV? Those are usually present even when the dual display is not set up. If you don't see those I would change out the cable in case they are defective
Sam
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